U.S. Signal Corps Radio unit, untested

U.S. Signal Corps Radio unit, untested

U.S. Signal Corps Radio unit, untested

U.S. Signal Corps Radio unit, untested

U.S. Signal Corps Radio unit, untested

U.S. Signal Corps Radio unit, untested

U.S. Signal Corps Radio unit, untested

U.S. Signal Corps Radio unit, untested

U.S. Signal Corps Radio unit, untested

U.S. Signal Corps Radio unit, untested

U.S. Signal Corps Radio unit, untested

U.S. Signal Corps Radio unit, untested

U.S. Signal Corps Radio unit, untested

U.S. Signal Corps Radio unit, untested

U.S. Signal Corps Radio unit, untested

U.S. Signal Corps Radio unit, untested

U.S. Signal Corps Radio unit, untested