[The History of the Telephone by Herbert N. Casson]@TWC D-Link book
The History of the Telephone

CHAPTER IV
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Here in one year it had become famous, and in three years it had become rich.

Bell's invincible patent was soon buttressed by hundreds of others.

An open-door policy was adopted for invention.

Change followed change to such a degree that the experts of 1880 would be lost to-day in the mazes of a telephone exchange.
The art of the telephone engineer has in thirty years grown from the most crude and clumsy of experiments into an exact and comprehensive profession.

As Carty has aptly said, "At first we invariably approached every problem from the wrong end.


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