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U.S. patents available from 1976 to present.
U.S. patent applications available from 2005 to present.

The first match was accidentally discovered in 1826 when John Walker scraped a stick with chemicals on the end against a stone floor.

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Number of patents: 1
Last date: July 04, 2006

Number	Title	Issue Date
7070375	Clamping fastener grip length indicator A temporary fastener includes a grip length indicator. By machining a flattened area into a body of the temporary fastener, by engraving an scale into the flattened area, and by attaching an indicator dot visible in the groove to a moving part of an internal assembl...	07/04/2006