Apollo Command Module (Block II) Central Timing Equipment Module, measuring 8 x 5 x 6, manufactured by General Time Corporation. Stenciled in red below the connectors, "Engineering Test Unit," and stenciled on the bottom with part numbers, "MF-456-0041-0082" and "MRDR-A152113-1, 203/98." Scattered marks and dings and some toned adhesive remnants, otherwise fine condition. The module served as a timing reference source for the Apollo Command Module telemetry and communications systems as well as onboard clocks. The Central Timing Unit Equipment provided precision square wave timing pulses of several frequencies to correlate all time-sensitive functions within the Apollo Command Module. It also generated and stored real-time day, hour, minute, and second of mission elapse and time in binary-coded decimal format for transmission to Mission Control in Houston via the Manned Space Flight Network.
