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AE 40 railway dispatcher's telephone of the type N-4069
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File:The practical telephone handbook and guide to the telephonic exchange (1906) (14755931752).jpg - Wikimedia Commons
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LOCAL BATTERY TELEPHONE EQUIPMENT (SIGNAL SCHOOL PAMPHLET, NO. 2)
Figure 35. Local-Battery Telephone Set with Induction Coil
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TELEPHONE HISTORY
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Electrical Communication - Magneto Local-Battery Switchboard
Historical telephony technologies and jargon - Old Australian Telephones
