Patent US198934 - IMPROVEMENT IN ADDING-REGISTERS FOR PENCILS

Patents

Inventors: CHAELES C. FIELDS, CHAELES C. FIELDS
Current U.S. Classification: 235/114; 235/64; 235/131.00R; 235/131.0FD; 235/140; 235/144.00S

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Citing Patent	Filing date	Issue date	Original Assignee	Title
US4453719	Nov 9, 1981	Jun 12, 1984		Phonetic/semantic systems, devices and methods of constructing and utilizing same