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

...that after Walter Hunt patented the safety pin in 1849, he sold the rights to it for $400?

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Class 362/534 - Railway truck actuated

Subclass of Class 362 - Illumination
Definition: Subject matter including a swiveling frame of wheels, (i.e.,
No. of patents: 0