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100 Years of Telephone Switching: Manual and Electromechanical Switching, 1878-1960's (Pt. 1)
100 Years of Telephone Switching Manual and Electromechanical Switching 18781960's - Pt. 1 Author:Robert J. Chapuis, Amos E. Joel In this work, not only the principles by which manual and automatic systems function are distinguished, but also the background to the invention is given. This is done from the perspective of an unbiased international observer.