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Old 13th Sep 2021, 8:05 pm   #2
rambo1152's Avatar
Join Date: May 2010
Location: Manchester, UK.
Posts: 3,103
Default Re: Siemens W28 telephone

I imagine the button served the same purpose as similar buttons on British phones, that of "Earth Leg Recall", so two subscribers could share a line. Search this forum for "Party line".

The earth connection was therefore "Functional", but I suppose it could have been used for lightning protection as well.
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