Tunzelmann, George William von, 1856- · New York, Scribner & Welford · leaf 199
ow how to do without them. The simplest way of explaining in a short compass theprinciples of the telephone exchange system will be to givean account of the actual exchanges in some one place, andI shall select the London system of exchanges for thatpurpose. Fig. 62 is a plan of the exchange system… … BATTERSEA BALHAM Fig. 62. Pla>
Electric industries · Electricity
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