That “caution” skirt is used for a blinker lamp key assembly and not a radio transmitter. 
https://www.navy-radio.com/morse/key/key-26003-lamp-1906-01.jpg

Nick


On Fri, Jun 9, 2023 at 6:07 PM Hubert Miller <kargo_cult@msn.com> wrote:
I assume because of the caution text on the knob skirt, this key was part of a specific radio equipment. Which set was that ? I bought it at SeaPac, thinking it might be a good fit for the ME-1 radio i have. Manual doesn't list the key, but it does say the finals are operating at their dissipation limits.
-Hue Miller



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