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This is a Quincy QR-25 compressor with Model 340 pump, that was made in 1951. The reassembly subdirectory shows pictures of a new motor being installed (I did not care for the old motor).
00 Reassembly
01 Low Pressure Discharge Valve
02 Compressed Air System
03 Is There Compressed Air On Mars Ad
04 Continuous Run vs On Demand
05 Single Phase Motor