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French four prong handset jack

Started by countryman, July 11, 2021, 07:35:50 AM

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The jack can be seen frequently, but I never saw a socket for it, or an instrument where it would go to?
Example auction:


I have seen this on German style field telephones and Danish telephones. the handset appears to be of a German pattern.


Don't some switchboards have a socket for a handset like that???
My SC turret has one on the front.


The German field phones I know have 5 prongs and a different pattern.
But in fact my Danish magneto phone has this type of plug! I had never thought of it. So it seems to be some type of international industry standard. Very well possible that it was used on switchboards on a more common basis.