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 400/546 - To facilitate condensed billing (i.e., by determining a desired limit or amount of retrograde or advance platen movement)

Subclass of Class 400 - Typewriting machines
Definition: Subject matter wherein significance is attributed to a typewriter
No. of patents: 0