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

"Flight by machines heavier than air is unpractical and insignificant, if not utterly impossible."

Simon Newcomb, astronomer ; Said in 1902, less than two years before the first flight at Kitty Hawk

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Class 168/40 - Cross pinned

Subclass of Class 168 - Farriery
Definition: Calk and shoe connected by a tenon-and-socket connection secured
No. of patents: 0