Combined ruler and solar cell calculator

Details Combined ruler and solar cell calculator Combined ruler and solar cell calculator

1983-08-02

1986-04-22

Holtje, Nelson C.

Printing and office machinery

Typewriter or calculator

Combined

D10 2, D10 71, D10 15, D18 7

Patent

active

D02835150

REFERENCES:
patent: D201300 (1965-06-01), Seely
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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