U.S. Signal Corps Power supply PP-109/GR, dated 1951, untested

U.S. Signal Corps Power supply PP-109/GR, dated 1951, untested

U.S. Signal Corps Power supply PP-109/GR, dated 1951, untested

U.S. Signal Corps Power supply PP-109/GR, dated 1951, untested

U.S. Signal Corps Power supply PP-109/GR, dated 1951, untested

U.S. Signal Corps Power supply PP-109/GR, dated 1951, untested

U.S. Signal Corps Power supply PP-109/GR, dated 1951, untested

U.S. Signal Corps Power supply PP-109/GR, dated 1951, untested

U.S. Signal Corps Power supply PP-109/GR, dated 1951, untested

U.S. Signal Corps Power supply PP-109/GR, dated 1951, untested

U.S. Signal Corps Power supply PP-109/GR, dated 1951, untested

U.S. Signal Corps Power supply PP-109/GR, dated 1951, untested

U.S. Signal Corps Power supply PP-109/GR, dated 1951, untested

U.S. Signal Corps Power supply PP-109/GR, dated 1951, untested

U.S. Signal Corps Power supply PP-109/GR, dated 1951, untested