WWII U.S. Army Signal Corps BX-37-A & BX-37-B IFF Keying Disc Sets

WWII U.S. Army Signal Corps BX-37-A & BX-37-B IFF Keying Disc Sets

Two original Signal Corps keying disc boxes, a BX-37-A supplied by General Electric and a BX-37-B supplied by The Vendo Co. Both contain numbered metal discs, with additional loose discs included as pictured. These were components of the wartime SCR-515 identification friend or foe (IFF) equipment. The boxes and plates show age and storage wear. Contents have not been checked for completeness; sold together as pictured.