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

In 1608, Dutch eyeglass maker Hans Lipperhey filed the first patent for a working telescope. The patent was denied.

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Class 33/604 - With piston

Subclass of Class 33 - Geometrical instruments
Definition: Subject matter wherein the gauge contacts the piston attached
No. of patents: 0