Growth ruler or the like

Details Growth ruler or the like Growth ruler or the like

1986-06-10

1990-06-26

Holtje, Nelson C.

Printing and office machinery

Typewriter or calculator

Calculator

Patent

active

D03088847

REFERENCES:
patent: D279358 (1985-06-01), Lichtman
patent: 1168059 (1916-01-01), Cuntz
patent: 1785866 (1930-12-01), Huene
patent: 2502300 (1950-03-01), Young
patent: 2532619 (1950-12-01), Heerich
patent: 2832252 (1958-04-01), Gabriel
patent: 3800454 (1974-04-01), Anderson
patent: 4418274 (1983-11-01), Masillo

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