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TonyDuell · 27th May 2019, 7:13 pm

The telephone 283 (a butt set) and as you say the 286B both have this line monitoring facility. I happen to have both of them here...

27th May 2019, 7:13 pm	#37
TonyDuell Dekatron Join Date: Jun 2015 Location: Biggin Hill, London, UK. Posts: 5,208	Re: "Butt" 'phone The telephone 283 (a butt set) and as you say the 286B both have this line monitoring facility. I happen to have both of them here...