Telephones, Their Construction and Fitting: A Practical Treatise on the Fitting-up and Maintenance of Telephones and the Auxiliary Apparatus
Frederick Charles Allsop
1892年1月 · E. & F.N. Spon
5.0star
1 則評論
電子書
256
頁數
關於這本電子書
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.