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

"We are probably nearing the limit of all we can know about astronomy."

Simon Newcomb, astronomer ; 1888

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Class 400/138 - By type-die mounted on carrier movable for selection of character

Subclass of Class 400 - Typewriting machines
Definition: Subject matter+ wherein a typewriter is provided
No. of patents: 0