Combined file card holder and calculator

Details Combined file card holder and calculator Combined file card holder and calculator

1989-11-29

1992-04-21

Dunkins, Bruce W.

Office supplies; artists and teachers materials

Office equipment not elsewhere specified

Holder or file

D19 75, D19 86, D19 90, D18 7

Patent

active

D03256014

REFERENCES:
patent: D285094 (1986-08-01), Li
patent: D291386 (1987-08-01), Johansson
patent: D303873 (1989-10-01), Brussing
patent: D308914 (1990-07-01), Chow
patent: D309213 (1990-07-01), Chaney
patent: D309626 (1990-07-01), Sakaguchi et al.
patent: D312839 (1990-12-01), Nemeth
patent: D317409 (1991-06-01), Chiarella
patent: D317458 (1991-06-01), Sawada et al.
patent: 4117931 (1978-10-01), Berkman
patent: 4821882 (1989-04-01), Messina

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