Threaded Front-Mounted Jack; with an Extra Contact Added in a Normally Closed Circuit with the #1; Contact. Insertion of a 4-Conductor Plug Closes the #1;-5 Contact Circuit.
Threaded Front-Mounted Jack; with an Extra Contact Added in a Normally Closed Circuit with the #1; Contact. Insertion of a 4-Conductor Plug Closes the #1;-5 Contact Circuit.
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