WWII US Navy Model OBU-3 Echo Box Test Set SHIPS 308-A Manual 1944 Confidential Back-to-School secured by canvas straps and

secured by canvas straps and metal hardware

The compact configuration makes it ideal for range use

typical of Vietnam-era M16 field equipment

22 rimfire

Don’t miss the chance to own a piece of history from the skies of the Second World War

WWII US Navy Model OBU-3 Echo Box Test Set SHIPS 308-A Manual 1944 Confidential Back-to-School secured by canvas straps andOriginal Preliminary Instruction Book for the Model OBU 3 Echo Box Test Set (SHIPS 308 A), manufactured for the U. S. Navy Department, Bureau of Ships by Johnson Service Company, Milwaukee, Wisconsin. This manual is dated June 15, 1944 and is marked Confidential (Non Registered), making it an interesting piece of WWII U. S. Navy electronics and radar test equipment history. The manual relates to the OBU 3 Echo Box Test Set used in the maintenance and