Re: Telephone exchange jackfield help
There are 15 cord retraction units closely spaced there are no holes and beneath there are amplifiers and power supplies.
The American device in the first link by dsk is the sort of principle I visualise, but with a jack at both ends of the device.
Pye, who made the OB vans, would have needed in total 150 of these so may have made them in their own factory, or was there a GPO unit that they could have used back in 1963?
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