Combined ruler, clock and calculator

Details Combined ruler, clock and calculator Combined ruler, clock and calculator

1983-08-02

1986-06-10

Holtje, Nelson C.

Printing and office machinery

Typewriter or calculator

Combined

D18 7, D10 71, D10 15, D10 2

Patent

active

D02841991

REFERENCES:
patent: D201300 (1965-06-01), Seely
patent: D248995 (1978-08-01), Hazama
patent: D258740 (1981-03-01), Matsumoto
patent: D271025 (1983-10-01), Li
patent: D279381 (1985-06-01), Leung
patent: 1334145 (1920-03-01), Eaton
patent: 4158229 (1979-06-01), Woo
patent: 4282571 (1981-08-01), Giovannoli
patent: 4382280 (1983-05-01), Mandel
patent: 4404643 (1983-09-01), Ojima
patent: 4530068 (1985-07-01), Nakanishi

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