The practical telephone handbook and guide to the telephonic exchange (1906)
Poole, Joseph · New York, Macmillan Co. · leaf 100
e blocks, so that thenumber of contacts is twenty-four as compared with eight inthe Crossley. It has been veryextensively used in France, andhas given very good results.It has also been extensivelyused for the transmission ofmusic, etc., from theatres. There have been many other forms of the pencil… … Fig. 66
Telephone
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