Parts and accessories for the goods of subclasses 45110 and 45130 (except covers, carrying cases and the like)

1. Scope and Applicability

This PCR addresses identifiable parts and accessories dedicated to typewriters, word-processing machines, electronic calculators, and pocket-size data recording, reproducing and displaying machines with calculating functions. Complete host machines, covers, carrying cases, general-purpose components without demonstrated host dedication, and repair services sold as services are excluded. The official classification source establishes the host scope, not a universal bill of materials (un-cpc-3-0-structure-2025).

The representative route supplies a finished rubber-coated typewriter platen as a good, starting with a prepared bare steel core and a purchased formulated SBR/NR coating compound. The steel-core choice is a foreground scenario to confirm by supplier drawings. Recoating and finishing evidence from Italian and US specialists supports the operations, not an assertion that all parts use this route. New and reused-core products must be separate datasets. Starting with a stripped core moves stripping and its waste into upstream preparation data; it does not eliminate them.

For calculator electronics, keyboards, gears or other dedicated parts, instantiate the actual single part number, BOM, material states and manufacturing process map. Individually add each actual exchange and audit its UUID; do not carry over platen materials or energy values. A platen dataset cannot represent electronic components. Component manufacture, upstream embodied burdens, rejected parts and host compatibility require distinct methods from complete-machine use accounting.

2. Product Category Identity

Field	Value
canonical_pcr_id	pcr.metal-products-machinery-and-equipment.office-accounting-and-computing-machinery.parts-and-accessories-for-the-goods-of-subclasses-45110-and-45130-except-covers-carryin-976151c5
classification_refs	CPC 3.0: 45170; un-cpc-3-0-structure-2025
covered_products	Host-dedicated mechanical and electronic parts within the scope above
excluded_products	Complete machines; covers; carrying cases; general-purpose parts; repair services
representative_product	Rubber-coated typewriter platen roller, declared model and core provenance
production_route	Prepared core receipt; rubber coating; vulcanization; precision finishing; inspection; packing
market_state	Accepted finished part at supplier gate; new or remanufactured status declared separately

3. Reference Flow

Field	Value
What	Provide paper support and feed contact in a compatible typewriter
How much	1 kg net accepted platen output; record corresponding piece count
How well	Meet model-specific diameter, runout, hardness, surface and paper-feed acceptance specifications documented by test
How long or cycle	One production batch at gate; no assumed host lifetime or replacement interval. Service comparisons require measured durability and installed duty
reference_flow_link	reference_product

Field	Value
Reference amount	1
Reference product flow	Typewriter platen roller
Reference flow property	Mass 93a60a56-a3c8-11da-a746-0800200b9a66
Reference unit group	Units of mass 93a60a57-a4c8-11da-a746-0800200c9a66
Reference unit	kg
Required qualifiers	part number; host model and function; drawing revision; dimensions; hardness acceptance method; polymer formulation; core material; new/reused core provenance; net piece mass; yield; site; period; energy technology; upstream preparation boundary; packaging; transport; intended service and durability evidence when comparing functions

This is a partial production reference, not a complete service-life comparison. Required qualifiers must accompany every foreground package. The 1 kg basis is a normalization choice; a durability-based functional comparison must calculate the necessary number and mass of replacement parts.

4. Measurement and Unit Rules

rule_id	Applies to	Required property	Required unit	Rule
net_reference	accepted product	Mass 93a60a56-a3c8-11da-a746-0800200b9a66	kg	Separate product net mass from packaging and waste; convert count using measured model-specific mass.
energy_conversion	electricity and steam heat	Energy	MJ	Convert metered kWh by 3.6 MJ/kWh; steam uses net enthalpy transfer, not an arbitrary fixed mass-to-energy factor.

5. System Boundary

rule_id	applies_to	Rule	source_ids
boundary_gate	foreground	Collect receipt-through-dispatch coating, curing, finishing, testing, packing and attributable losses. Connect purchased inputs to upstream supply and actual transport; connect exported waste to treatment. Report the resulting cradle-to-gate partial boundary and all exclusions.	ghg-protocol-product-standard
boundary_operations	platen_production	Collect coating and finishing as specified in the route; preparation, autoclave and grinding evidence guides process inclusion, but supplier-specific hardness recommendations are not universal limits.	vescovo-platen-recovery; jjshort-typewriter-platen
boundary_extension	other_parts	For a different part or technology replace the representative BOM with the measured BOM and explicit atomic exchanges. Include on-site compounding, bonding, cleaning, coating emissions or boiler operation whenever present; verify each chemical and emission separately before declaring the inventory complete.	ghg-protocol-product-standard

Boundary Abstraction

Field	Value
declared_starting_condition	Bare prepared steel platen core and delivered formulated rubber compound
starting_condition_role	foreground_input
product_classification_scope	Machine-dedicated parts; no complete-machine use phase
recursive_input_rule	Record a purchased same-category core once with its state-specific upstream dataset; do not recursively create an identical foreground copy. Internally circulated rework is not another purchase.
upstream_dataset_requirement	Document core manufacture or recovery, stripping, cleaning, removed rubber treatment, compound formulation and transport in supplier datasets. No zero-burden core assumption without explicit reuse allocation.
disclosure	Preparation location; core history; supplier datasets; missing stages; allocation; installed service outside this partial inventory

6. Process Inventory Structure

Process Map

process_id	process_name	inclusion	inclusion_condition	role	quantitative_reference
platen_production	Coating, curing, finishing and dispatch	required	Representative prepared-core platen route	foreground_production	1 kg

Process: Coating, curing, finishing and dispatch (platen_production)

Inputs

Product flows

Steel typewriter platen core (core)

This exchange is measured at the coating-and-finishing boundary using its dedicated batch protocol.

• Selected flow: Steel typewriter platen core
• Flow property / unit: Mass / kg
• Amount rule: Record the dry net mass of prepared bare cores issued, returned and remaining in stock; retain supplier preparation and new/reused status.
• Value mode: Foreground record (foreground_record)
• Specificity: Site-specific (site_specific)
• Normalization basis: per 1 kg accepted net platen output
• Basis kind: Reference flow (reference_flow)
• Evidence kind: Collected record (collected_record)
• Collection protocol: cp_core

Unvulcanized SBR/NR compound for platen coating (compound)

This exchange is measured at the coating-and-finishing boundary using its dedicated batch protocol.

• Selected flow: Unvulcanized SBR/NR compound for platen coating
• Flow property / unit: Mass / kg
• Amount rule: Weigh the formulated compound as delivered and issued; retain recipe or supplier composition, curing system and returned uncured stock. Do not also count its constituent polymers as separate purchased inputs.
• Value mode: Foreground record (foreground_record)
• Specificity: Site-specific (site_specific)
• Normalization basis: per 1 kg accepted net platen output
• Basis kind: Reference flow (reference_flow)
• Evidence kind: Collected record (collected_record)
• Collection protocol: cp_compound

Electricity (electricity)

This exchange is measured at the coating-and-finishing boundary using its dedicated batch protocol.

• Selected flow: Electricity 890a70b7-b677-4e2a-8a1b-7d017e0a10ae
• Flow property / unit: Net calorific value / MJ
• Amount rule: Meter coating, electric curing when used, machining, extraction and inspection electricity including attributable idle cycles; exclude electricity already included in purchased steam production.
• Value mode: Foreground record (foreground_record)
• Specificity: Site-specific (site_specific)
• Normalization basis: per 1 kg accepted net platen output
• Basis kind: Reference flow (reference_flow)
• Evidence kind: Collected record (collected_record)
• Collection protocol: cp_electricity

heat, steam (steam)

This exchange is measured at the coating-and-finishing boundary using its dedicated batch protocol.

• Selected flow: heat, steam 74d07391-d5e4-4beb-bd80-4fe9a7617cf1
• Flow property / unit: Gross calorific value / MJ
• Amount rule: inclusion_condition: purchased steam supplies the autoclave. Measure net delivered heat using steam flow and inlet/return enthalpy; retain pressure, temperature, condensate return and supplier boundary. If steam is generated on site, instantiate the boiler fuel, water, blowdown and individual emissions instead of buying steam from the same foreground system.
• Value mode: Foreground record (foreground_record)
• Specificity: Site-specific (site_specific)
• Normalization basis: per 1 kg accepted net platen output
• Basis kind: Reference flow (reference_flow)
• Evidence kind: Collected record (collected_record)
• Collection protocol: cp_steam

corrugated board boxes (box)

This exchange is measured at the coating-and-finishing boundary using its dedicated batch protocol.

• Selected flow: corrugated board boxes 4f197bec-7b3b-11dd-ad8b-0800200c9a66
• Flow property / unit: Mass / kg
• Amount rule: inclusion_condition: corrugated boxes are used at the dispatch gate. Weigh empty boxes and allocate actual batch use to accepted net platen output; exclude box mass from product reference mass.
• Value mode: Foreground record (foreground_record)
• Specificity: Site-specific (site_specific)
• Normalization basis: per 1 kg accepted net platen output
• Basis kind: Reference flow (reference_flow)
• Evidence kind: Collected record (collected_record)
• Collection protocol: cp_box

Outputs

Product flows

Typewriter platen roller (reference_product)

This exchange is measured at the coating-and-finishing boundary using its dedicated batch protocol.

• Selected flow: Typewriter platen roller
• Flow property / unit: Mass / kg
• Amount rule: Weigh accepted finished platens after dimensional, hardness and functional inspection; normalize the accepted net product output to 1 kg. Record piece count and measured net mass per model.
• Value mode: Foreground record (foreground_record)
• Specificity: Site-specific (site_specific)
• Normalization basis: per 1 kg accepted net platen output
• Basis kind: Reference flow (reference_flow)
• Evidence kind: Collected record (collected_record)
• Collection protocol: cp_reference_product

Waste flows

Waste rubber (rubber_waste)

This exchange is measured at the coating-and-finishing boundary using its dedicated batch protocol.

• Selected flow: Waste rubber b4818cb7-cbef-403a-9fc3-a12fe8baf092
• Flow property / unit: Mass / kg
• Amount rule: Weigh captured rubber removed during finishing and dispatched to a documented treatment route. Do not count captured material as airborne elementary emissions; measure uncaptured emissions individually where present.
• Value mode: Foreground record (foreground_record)
• Specificity: Site-specific (site_specific)
• Normalization basis: per 1 kg accepted net platen output
• Basis kind: Reference flow (reference_flow)
• Evidence kind: Collected record (collected_record)
• Collection protocol: cp_rubber_waste

Rejected typewriter platen roller (reject)

This exchange is measured at the coating-and-finishing boundary using its dedicated batch protocol.

• Selected flow: Rejected typewriter platen roller
• Flow property / unit: Mass / kg
• Amount rule: inclusion_condition: whole rejected platens leave for waste treatment. Weigh these separately from rubber grinding waste; retained rework is an internal loop and is not an exported waste.
• Value mode: Foreground record (foreground_record)
• Specificity: Site-specific (site_specific)
• Normalization basis: per 1 kg accepted net platen output
• Basis kind: Reference flow (reference_flow)
• Evidence kind: Collected record (collected_record)
• Collection protocol: cp_reject

7. Allocation and Co-product Handling

rule_id	applies_to	Rule	source_ids
allocation_subdivide	shared_operations	Use batch submetering and process subdivision first. Where unavoidable, allocate shared machine energy using measured operating time and load; justify the physical relationship. Use economic allocation only with a documented reason why physical allocation is unsuitable and disclose sensitivity.	ghg-protocol-product-standard
allocation_reuse	core_and_waste	Disclose the selected reuse/recycling allocation and inherited core burdens. Do not automatically credit avoided new cores or future machine service. Keep waste treatment separate from coproduct allocation; no duplicate virgin-material substitution credit.	ghg-protocol-product-standard

8. Foreground Data Collection, Calculation, and Quality Rules

Data Collection Protocols

protocol_id	process_id	flow_role	record_type	raw_fields	collection_method	unit	frequency	temporal_coverage	site_scope	aggregation_rule	quality_evidence
cp_core	platen_production	core	batch record	batch_id; part_number; dates; opening_stock; receipts; returns; closing_stock; net_quantity; unit; accepted_output; meter_id; destination	Calibrated weighing or submetering; reconcile invoices, issue notes and waste transfers; steam additionally records inlet and return states	kg	each batch	Declared representative production period including idle and failed batches	One identified site and route	Sum net exchange over the same period and divide by accepted net kg; reference output divided by itself	Calibration, traceable tickets, BOM revision, meter reconciliation and inspection records
cp_compound	platen_production	compound	batch record	batch_id; part_number; dates; opening_stock; receipts; returns; closing_stock; net_quantity; unit; accepted_output; meter_id; destination	Calibrated weighing or submetering; reconcile invoices, issue notes and waste transfers; steam additionally records inlet and return states	kg	each batch	Declared representative production period including idle and failed batches	One identified site and route	Sum net exchange over the same period and divide by accepted net kg; reference output divided by itself	Calibration, traceable tickets, BOM revision, meter reconciliation and inspection records
cp_electricity	platen_production	electricity	batch record	batch_id; part_number; dates; opening_stock; receipts; returns; closing_stock; net_quantity; unit; accepted_output; meter_id; destination	Calibrated weighing or submetering; reconcile invoices, issue notes and waste transfers; steam additionally records inlet and return states	MJ	each batch	Declared representative production period including idle and failed batches	One identified site and route	Sum net exchange over the same period and divide by accepted net kg; reference output divided by itself	Calibration, traceable tickets, BOM revision, meter reconciliation and inspection records
cp_steam	platen_production	steam	batch record	batch_id; part_number; dates; opening_stock; receipts; returns; closing_stock; net_quantity; unit; accepted_output; meter_id; destination	Calibrated weighing or submetering; reconcile invoices, issue notes and waste transfers; steam additionally records inlet and return states	MJ	each batch	Declared representative production period including idle and failed batches	One identified site and route	Sum net exchange over the same period and divide by accepted net kg; reference output divided by itself	Calibration, traceable tickets, BOM revision, meter reconciliation and inspection records
cp_box	platen_production	box	batch record	batch_id; part_number; dates; opening_stock; receipts; returns; closing_stock; net_quantity; unit; accepted_output; meter_id; destination	Calibrated weighing or submetering; reconcile invoices, issue notes and waste transfers; steam additionally records inlet and return states	kg	each batch	Declared representative production period including idle and failed batches	One identified site and route	Sum net exchange over the same period and divide by accepted net kg; reference output divided by itself	Calibration, traceable tickets, BOM revision, meter reconciliation and inspection records
cp_reference_product	platen_production	reference_product	batch record	batch_id; part_number; dates; opening_stock; receipts; returns; closing_stock; net_quantity; unit; accepted_output; meter_id; destination	Calibrated weighing or submetering; reconcile invoices, issue notes and waste transfers; steam additionally records inlet and return states	kg	each batch	Declared representative production period including idle and failed batches	One identified site and route	Sum net exchange over the same period and divide by accepted net kg; reference output divided by itself	Calibration, traceable tickets, BOM revision, meter reconciliation and inspection records
cp_rubber_waste	platen_production	rubber_waste	batch record	batch_id; part_number; dates; opening_stock; receipts; returns; closing_stock; net_quantity; unit; accepted_output; meter_id; destination	Calibrated weighing or submetering; reconcile invoices, issue notes and waste transfers; steam additionally records inlet and return states	kg	each batch	Declared representative production period including idle and failed batches	One identified site and route	Sum net exchange over the same period and divide by accepted net kg; reference output divided by itself	Calibration, traceable tickets, BOM revision, meter reconciliation and inspection records
cp_reject	platen_production	reject	batch record	batch_id; part_number; dates; opening_stock; receipts; returns; closing_stock; net_quantity; unit; accepted_output; meter_id; destination	Calibrated weighing or submetering; reconcile invoices, issue notes and waste transfers; steam additionally records inlet and return states	kg	each batch	Declared representative production period including idle and failed batches	One identified site and route	Sum net exchange over the same period and divide by accepted net kg; reference output divided by itself	Calibration, traceable tickets, BOM revision, meter reconciliation and inspection records

Calculation Rules

rule_id	Applies to	Formula or rule	Inputs	Output	source_ids
normalize	all_rows	q_i = net exchange_i / accepted net product mass; reconcile stock changes before division; retain rejected-batch burdens	matched-period measured quantities	unit/kg accepted product
mass_balance	solid_material	Core + compound input = accepted product + exported solid waste + stock change + measured losses; investigate residual against instrument uncertainty, never force closure	net solid masses	kg residual and explanation

Data Quality Requirements

requirement_id	Applies to	Requirement	Evidence
quality_traceability	all_rows	Use site primary records; separate missing, measured zero and demonstrably absent flows. Do not extrapolate across core histories, electronic/mechanical technologies or grids without qualification.	ghg-protocol-product-standard; cp_*
quality_function	reference_product	Retain model-specific drawing, hardness method, dimensions, inspection outcomes and actual rejected mass; manufacturer hardness examples are not universal acceptance limits.	vescovo-platen-recovery; jjshort-typewriter-platen

9. Validation Rules

rule_id	applies_to	Rule	source_ids
validate_identity	reference_product	Reject incompatible host parts, missing qualifiers or an unresolved UUID silently replaced by a generic machine flow.	un-cpc-3-0-structure-2025
validate_inventory	all_rows	Check atomic exchange identity, flow type, units, normalization period, upstream coverage and completeness of conditional operations. Verify electricity and purchased steam do not duplicate heat generation.
validate_balance	production	Require accepted product mass greater than zero and explain stock-adjusted mass imbalance using measurement uncertainty. Missing evidence is inconclusive, not a zero or an invented range.

10. Published Dataset Profile

Field	Value
dataset_role	foreground_data_package
downstream_use	secondary_dataset; background_dataset
allowed_use	Declared part and route supply inventory for compatible machine manufacture or replacement studies
excluded_use	Unqualified whole-machine footprint; lifetime benefit claims; calculator electronics represented by platen data
required_metadata	Reference qualifiers; BOM; process map; location; dates; upstream datasets; allocation; transport and waste destinations
required_quality_disclosure	Missing inputs; unconfirmed identities; measured coverage; exclusions; uncertainty; route changes; absent empirical ranges
update_trigger	Change in part design, compound, core provenance, energy supply, process or supplier evidence

11. Data Sources

Source id	Type	Reference	Used for
un-cpc-3-0-structure-2025	official_guidance	UN Statistics Division, CPC 3.0 Structure, 30 June 2025. https://unstats.un.org/unsd/classifications/Econ/Download/In%20Text/CPC_Ver_3.0_Structure_30Jun2025.csv	Entries 45110, 45130 and 45170; classification scope. Verified 2026-09-08.
ghg-protocol-product-standard	standard	WRI/WBCSD, Product Life Cycle Accounting and Reporting Standard (2011), chapters 6–9. https://ghgprotocol.org/sites/default/files/standards/Product-Life-Cycle-Accounting-Reporting-Standard_041613.pdf	Unit of analysis, partial-boundary disclosure, primary records and allocation hierarchy; used as GHG accounting guidance, not a complete multi-impact LCA specification. Verified 2026-09-08.
vescovo-platen-recovery	handbook	Vescovo Restauri, European Typewriter Platen Recovery Service. https://www.vescovorestauri.it/laboratorio/european-typewriter-platen-recovery-service/	Italian route: SBR/NR coating, vulcanization, dimensional finishing; qualitative process evidence only. Verified 2026-09-08.
jjshort-typewriter-platen	handbook	J.J. Short Associates, Typewriter Platens, Feed Rollers, Bail Rollers, Finger Rollers and Power Rollers. https://www.jjshort.com/typewriter-platen-repair.php	US specialist: stripping, recoating, precision grinding, model-specific rubber and hardness. No numerical inventory range. Verified 2026-09-08.