Technical manual. 11-2748. Installation of radio and interphone equipment in tank, medium, M4A3 or M4A3E2, 75-mm gun, wet stowage, tank, medium, M4A1, or M4A3, 76-mm gun, wet stowage tank, medium, M4 or M4A3, 105-mm howitzer, Changes 2: June 20, 1945.