Quote:
Originally Posted by russell_w_b
I need to check in Herbert G. White's 'Telephone Erection and Maintenance' but I'm pretty sure some sets were made specifically to use existing annunciator wiring without too much modification.
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I thought as much... The first chapter is all about utilising existing bell / annunciator circuits for telephone use. Evidently
'such instruments are in everyday use, and their number is increasing rapidly...' This was October 1922.