The practical telephone handbook and guide to the telephonic exchange (1906)
Poole, Joseph · New York, Macmillan Co. · leaf 586
Dining-Room Fig. 503.— Metaphone Connections Kitchen flexible cord is connected directly to the two terminals of thepush button. The kitchen class of instrument is connecteddirectly in series with the bell, and is so arranged that whenhung up out of use it is short-circuited. Fig. 503 shows the…
Telephone
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