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US Morse Keys

  • J-37 - The most widely used of the WW II military straight keys. Had black oval plastic base inscribed "J-37" and either brass or nickel plated screws. The levers were made of nickel plated or black anodized steel. There was a leaf spring used in J-37 to return key lever. 

    J-37 key was a principal part of several US Signal Corps keys like J-44, J-45 or J-47.

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