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

British merchant Peter Durand invented the tin can in 1810.

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Class 351/127 - Ball or chain type

Subclass of Class 351 - Optics: eye examining, vision testing and correcting
Definition: Subject matter wherein the bridge connecting the lens holding
No. of patents: 0