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

...Daniel Webster invented a "bull plow" to pull out tree stumps. It didn't catch on because it was huge and required four oxen to pull it!

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Class 251/19 - Auxiliary pilot valve overrides a first pilot valve

Subclass of Class 251 - Valves and valve actuation
Definition: Subject matter in which the main valve is opened by adjustment
No. of patents: 0