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acres Alexander Graham Bell alloy American Telephone Bell engineers Bell System securities Bell Telephone Laboratories beneﬁt Boston broadcasting buildings called cent central ofﬁce Chicago commercial communication connected Conversation by overhead Desk Telephone employees exchange ﬁelds ﬁgures ﬁnancial ﬁnd ﬁrst ﬁve Houlton increasing installed invention Loading Coil long distance machines magneto manufacture ment messages miles—Boston miles—New York multiple switchboard nected Oﬂice operators overhead line Paciﬁc pany phone service plant pole population possible Professor Bell radio telephone service receiving stations scientiﬁc ship-to-shore speech submarine telephone cable subscribers talking tele Telegraph Company Telephone and Telegraph telephone apparatus telephone art telephone cable telephone circuits Telephone Company telephone development telephone industry telephone instrument telephone lines telephone switchboard telephone users telephones in Bell teletypewriter Terminal Room Theodore N thousands tion trafﬁc transatlantic Transcontinental transmission transmitted tween underground cable United Western Electric Company York City