Telephone Construction: Installation, Wiring, Operation and Maintenance (Classic Reprint)
Fb&c Limited, 2017 - 254 стор.
Excerpt from Telephone Construction: Installation, Wiring, Operation and Maintenance
Telephone Engineering, although one of the youngest of the engineering professions, and per haps the most handicapped at the start, stands to day among those most active and advanced. Start ing with a simple invention of Prof. Alexander Graham Bell in 1876, the history of the telephone extends over a period of only thirty-eight years. For several years after its birth, the telephone was looked upon as a mere toy, and, until the patents covering its important parts were bought by a corporation and a working system established, none realized the great future in store for it.
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