Clipboard with an integral calculator

Details Clipboard with an integral calculator Clipboard with an integral calculator

1984-09-20

1986-07-15

Zarfas, Louis J.

Office supplies; artists and teachers materials

Office equipment not elsewhere specified

Holder or file

D18 2, D18 7

Patent

active

D02846780

REFERENCES:
patent: D218720 (1970-09-01), Shahan
patent: D236721 (1975-09-01), Stolberg
patent: D279197 (1985-06-01), Chi Hung
patent: 799873 (1905-09-01), Senge

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