[CW] How old is the J-5-A Key

[alan KI7WO]

Hi Guys,

Anyone tell me when the Signal Corp, U S Army J-5-A  "flameproof" key
came out?

Also have a J-37, J-38 & a J-47.  Thought there might be some interesting
history here.

TU,

Alan  KI7WO
/

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