MIL-P-642D, MILITARY SPECIFICATION: PLUGS, TELEPHONE, AND ACCESSORY SCREWS, GENERAL SPECIFICATION FOR (27-FEB-1979) [S/S BY MIL-DTL-642E]

MIL-P-642D, MILITARY SPECIFICATION: PLUGS, TELEPHONE, AND ACCESSORY SCREWS, GENERAL SPECIFICATION FOR (27-FEB-1979) [S/S BY MIL-DTL-642E]., This specification covers telephone plugs used in telephone (including telephone switchboard consoles), telegraph, and teletype circuits, and for connecting headsets, handsets, and microphones into communications circuits.