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Continuous wave
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Timeline of the telephone
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Telephone exchange names
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History of the telephone
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Speed dial
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Wikipedia Links
http://doc.telephonecollectors.info/dm/BTL_History_Physical_Sciences_1983_op_r.pdf#page=34
Anchor text: ''A History of Engineering and Science in the Bell System'', page 10
http://doc.telephonecollectors.info/dm/53_PTM_San_Franciscos_Last_Manual_Exchange.pdf
Anchor text: San Francisco Bids Good-bye to Manual