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Telegraph and Telephone Networks 在线电子书 pdf 下载 txt下载 epub 下载 mobi 下载 2024

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Jarnow, Jesse 作者

Rosen Pub Group

译者

2003-8 出版日期

32 页数

$ 27.06 价格

LIB

丛书系列

9780823940257 图书编码

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In 1848, it could take more than a month for a letter from New York to be delivered to California. By 1861, more than 2,000 telegraph offices dotted cities and towns throughout the United States. Telegraph messages could reach their destinations within hours. In 1876, when Alexander Graham Bell offered to sell his new invention--the telephone--to the Telegraph Company, it declined, calling the telephone a toy. By 1900, there were 800,000 telephones in the country.

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