Information on the 3000 type relays
http://www.samhallas.co.uk/repository/documents/yellow_book_complete.pdf
on Sam's pages
Great GPO Educational Pamplet on Ordinary Final Selectors
http://www.samhallas.co.uk/repository/documents/ep_telephones_3_4.pdf
on Sam's pages
Notes on final selector of UAX 13
http://www.uax.me.uk/uax13/at60085n.pdf
on Andy Greening' s pages
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