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The specifics of J-37 was a leaf spring used to
return the lever. 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. J-37
key was a principal part of several other US Signal
Corps keys incl. J-43, J-44, J-45 and J-47 so there was
a real "J-37 Family of Keys" around.
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