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Sparks · 26th Mar 2020, 2:33 pm

I've only come across this connector when it's been attached to a headset, for example, to connect to a radio, telephone and intercom console in an airport control tower or coastguard station, for example. Did Post Office Telephones ever use them in in their Plan installations, along the lines of the 420 and 520 ?

Thankyou.

26th Mar 2020, 2:33 pm	#1
Sparks Heptode Join Date: Oct 2006 Location: Leeds, West Yorkshire, UK. Posts: 598	GPO/BPO 620 plug, 6 way I've only come across this connector when it's been attached to a headset, for example, to connect to a radio, telephone and intercom console in an airport control tower or coastguard station, for example. Did Post Office Telephones ever use them in in their Plan installations, along the lines of the 420 and 520 ? Thankyou. Attached Thumbnails