Telephones, Their Construction and Fitting: A Practical Treatise on the Fitting-up and Maintenance of Telephones and the Auxiliary Apparatus
Frederick Charles Allsop
Jan 1892 · E. & F.N. Spon
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Receivers / transmitters / switch-bells / magneto generator / relays / switches and switch-boards / overhead and earth wires / connecting-up / private exchange systems for hotels and other large buildings / public exchange systems / testing for faults.