The practical telephone handbook and guide to the telephonic exchange (1906)
Poole, Joseph · New York, Macmillan Co. · leaf 298
of rings being given correspondingto their number on the wire—all the bells of the stations con-nected to the same leg of the loop being rung at the sametime, those on the other leg being undisturbed. The Xstation bells are rung by the regular ringing key of an ordinaryCJB. switch-board, but the Y…
Telephone
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