Combined calculator and puzzle or similar article

Details Combined calculator and puzzle or similar article Combined calculator and puzzle or similar article

1988-06-07

1990-11-13

Holtje, Nelson C.

Printing and office machinery

Typewriter or calculator

Combined

D18 7

Patent

active

D03120937

REFERENCES:
patent: D235452 (1975-06-01), Ikeda
patent: D235879 (1975-07-01), Kitai
patent: 1101567 (1914-06-01), Ridgway
patent: 4104728 (1978-08-01), Kasubuchi
patent: 4351988 (1982-09-01), Allbright

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