6 Свободни изкуства за Early Telephones

PSM V12 D583 Bell telephone in use
Aparat mikrotelefonowy Fig. A (77464)
Manual telephone exchange board, Frontispiece (Rankin Kennedy, Electrical Installations, Vol V, 1903)
Fire-alarm telephone (Rankin Kennedy, Electrical Installations, Vol V, 1903)
Typical telephone instruments (Rankin Kennedy, Electrical Installations, Vol V, 1903)
Street telephone for tramways (Rankin Kennedy, Electrical Installations, Vol V, 1903)
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