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Z)sline. When his bell rang, subscriber D moved his substationswitch from the right-hand to the left-hand contact, thus dis-connecting his substation burglar alarm circuit from his lineand connecting in his telephone, T-D. The operator, after notifying subscriber D that subscriber Bwished to talk with him, removed plug P-d from the left-handhole, moved switch 5 to its right-hand contact, and insertedplug Q, at the end of cord C, in hole H-d. This placed thetelephones of subscriber B, the operator and subscriber D all inone circuit (Fig. 4). The operator could thus determine, bylistening in, when the conversation was finished. When thisoccurred, the operator withdrew plug Q from hole H-d, re- 209
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annunciators A-b and A-d (the latterhaving fallen when its galvanometer circuit was opened), andclosed switch W. The apparatus at the central office and sub-stations was then in readiness for another call to be made. G. K. Thompson,R. B. Hill. Note: The authors wish to express their indebtedness to Mr.W. L. Richards, Consulting Historian of the Bell TelephoneLaboratories, for his assistance in the preparation of this arti-cle. 211 Worlds Telephone Statistics January 1, 1929 ACCORDING to the latest annual survey of the worldstelephones which was recently completed by the ChiefStatisticians Division of the American Telephone and Tele-graph Company, there were 32,712,284 telephones in the wor
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The copyright was injected into the public domain for other reasons, such as failure to adhere to required formalities or conditions;
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The institution has legal rights sufficient to authorize others to use the work without restrictions.
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The following pages on the English Knowledge use this file (pages on other projects are not listed):
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https://archive.org/stream/belltelephonemag09amerrich/belltelephonemag09amerrich#page/n213/mode/1up
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and was confirmed to be licensed under the terms of the No known copyright restrictions.
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to this image if more specific information about copyright status can be determined. See
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bookpublisher:_New_York__American_Telephone_and_Telegraph_Co___etc__
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https://www.flickr.com/photos/internetarchivebookimages/14569847558/
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https://www.flickr.com/photos/internetarchivebookimages/14569847558
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American Telephone and Telegraph Company. Information Dept
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bookauthor:American_Telephone_and_Telegraph_Company
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bookauthor:American_Telephone_and_Telegraph_Company
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