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...that the inventor of the electric motor was a blacksmith named Thomas Davenport? Described as "a brilliantly unsuccessful inventor", Davenport invented the first rotary electric motor. In 1836 he headed out -- on foot -- from his Vermont home to file a patent application at the Patent Office in Washington, D.C. By the time he got there, he had squandered away his money and couldn't afford the $30 filing fee so he turned around and went home. When he later mailed in his application with money he'd raised, the Patent office was destroyed in a fire. He did finally get credit for his invention on Feb. 5, 1837.

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Class 451/474 - For movement of conoid members relative to each other


Subclass of Class 451 - Abrading
Definition: Carrier wherein the members are moved toward or away from
No. of patents: 1
Last issue date: 06/18/1996


NumberTitleIssue Date
5527214Roughing finishing honing tool with push/pull expansion mechanism
The tool includes a body which supports angularly spaced roughing hones and angularly spaced finishing hones for radially inward and outward movement between collapsed and expanded positions. Expansion of the roughing hones is effected by axially spaced r...
06/18/1996
 
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