Digital abacus

Details Digital abacus Digital abacus

1996-11-26

1998-10-13

Veynar, Caron D.

Printing and office machinery

Typewriter or calculator

Calculator

1801

Patent

active

D03995224

REFERENCES:
patent: D181754 (1957-12-01), Schott
patent: D198847 (1964-08-01), Mathison
patent: D215004 (1969-08-01), Oota
patent: D282669 (1986-02-01), Conlee, Jr.
patent: D284975 (1986-08-01), Kwok
patent: 3731401 (1973-05-01), Kojima
patent: 4812124 (1989-03-01), Colodner et al.
patent: 5134692 (1992-07-01), Hiromori

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