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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Class 411/981 - Coiled washer

Subclass of Class 411 - Expanded, threaded, driven, headed, tool-deformed, or locked-threaded fastener
Definition: Art collection under art collection 980 wherein the device
No. of patents: 0