The practical telephone handbook and guide to the telephonic exchange (1906)
Poole, Joseph · New York, Macmillan Co. · leaf 104
Fig. 72 Scale £ Fig. 73 parative tests have shown that it is at least the equal of anytransmitter in use for long-distance work, with local batteryworking. 82 PRACTICAL TELEPHONE HANDBOOK The instrument is made up in an aluminium case, A and b>made in two parts. The back part of the case b has a…
Telephone
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