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Originally Posted by Whirled One
Other examples... ...include "phone plugs" (specifically, the 1/4" variety), which as far as I know first appeared on Bell Telephone switchboard equipment, but later started finding use in a whole range of audio devices..
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Interestingly enough, there is a slight difference in size between T-R-S (tip-ring-sleeve) patchbay phone plugs and today's ubiquitous 1/4" phone plug. I learned that the usual way, the hard way!