WWII US Navy Model OBU-3 Echo Box Test Set SHIPS 308-A Manual 1944 Confidential

Original 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 testing of naval electronic systems.

Features

• Original WWII U.S. Navy manual
• Model OBU-3 Echo Box Test Set
• SHIPS 308-A
• Bureau of Ships publication
• Dated June 15, 1944
• Marked Confidential (Non-Registered)
• Manufactured by Johnson Service Company
• Original black textured binder

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