Printing and office machinery – Typewriter or calculator – Calculator
Patent
1988-11-23
1991-07-23
Holtje, Nelson C.
Printing and office machinery
Typewriter or calculator
Calculator
D 7553, D19 92
Patent
active
D03184811
REFERENCES:
patent: D254944 (1980-05-01), Lee et al.
patent: D262120 (1981-12-01), Halm
patent: D310094 (1990-08-01), Noguchi
patent: 1754713 (1930-04-01), Green
ADD-IT Systems Incorporated
Holtje Nelson C.
Veynar Caron D.
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