U.S. patents available from 1976 to present.
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Mark Twain (Samuel L. Clemens) received Patent No. 121,992 for "An Improvement in Adjustable and Detachable Straps for Garments." He later received two more patents: one for a self-pasting scrapbook and one for a game to help players remember important historical dates.

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Class 33/1SP - Radius and spiral


Subclass of Class 33 - Geometrical instruments
No. of patents: 2
Last issue date: 09/21/1993


NumberTitleIssue Date
5246375Memory aiding device
A memory aiding device for aiding in remembering a predetermined personal identification number. A substrate has sequence representing integers predisposed on it in rows and columns for representing a personal identification number. Each respective sequen...
09/21/1993
4119890Method and equipment for measuring the distance between two points
Displays of first and second points are generated on a fluorescent screen. A first mark, which coincides with the display of said first point, is displayed on said fluorescent screen. A linear second mark is displayed on said fluorescent screen. A paramet...
10/10/1978
 
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