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Professionals rate top-10 engineering achievements

The laser, the transistor, and the communications satellite, developed by American Telephone and Telegraph Company's Bell Laboratories, rate as three of the top-10 engineering achievements of the past 50 years, according to the National Society of Professional Engineers.

In a list released Friday to celebrate its 50th anniversary, the society also included such achievements as unraveling the mysteries of the nuclear chain reaction, the Apollo 11 moon landing, and the development of the Boeing 707 aircraft and of nylon.

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