Section 4.705-3 - Acquisition and supply records(a) Store requisitions for materials, supplies, equipment, and services: Retain 2 years.(b) Work orders for maintenance and other services: Retain 4 years.(c) Equipment records, consisting of equipment usage and status reports and equipment repair orders: Retain 4 years.(d) Expendable property records, reflecting accountability for the receipt and use of material in the performance of a contract: Retain 4 years.(e) Receiving and inspection report records, consisting of reports reflecting receipt and inspection of supplies, equipment, and materials: Retain 4 years.(f) Purchase order files for supplies, equipment, material, or services used in the performance of a contract; supporting documentation and backup files including, but not limited to, invoices, and memoranda; e.g., memoranda of negotiations showing the principal elements of subcontract price negotiations (see 52.244-2): Retain 4 years.(g) Production records of quality control, reliability, and inspection: Retain 4 years.(h) Property records (see FAR 45.101 and 52.245-1): Retain 4 years.48 FR 42113, Sept. 19, 1983, as amended at 63 FR 34060, June 22, 1998; 75 FR 38679 , July 2, 2010