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Apollo Command Module Premodulation Processor Equipment Assembly, measuring 10.5″ x 7″ x 5″, lacking its Collins Radio manufacturer's plate. The body is marked "C28-1A111" and "Assy 514-0040-011." Four ports on the top are labeled "J1" through "J4." The Apollo CM's Premodulation Processor was a piece of radio communications equipment that processed, modulated, and combined data and voice signals for transmission to Earth.
