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Old 29th Nov 2017, 10:18 pm   #3
Join Date: Oct 2014
Location: West Midlands, UK.
Posts: 1,195
Default Re: GPO 706/746 Ringer on/off Button

From dim & distance memory of fitting Plan1A, where bells were in series, the button was marked on/off and using the switch in reverse will show the bell on, when in fact it's off. (Unless my memory is playing tricks as it's about 47 years since I last was on subs app fitting)
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