Ruler/mathematical aid

Details Ruler/mathematical aid Ruler/mathematical aid

1987-12-09

1991-05-21

Holtje, Nelson C.

Measuring, testing, or signalling instruments

Measuring, regulating or indicating instrument, or casing

Geometric

Patent

active

D03169782

REFERENCES:
patent: D135722 (1943-05-01), Vetter
patent: D137459 (1944-03-01), Colmery
patent: D148434 (1948-01-01), Owen, Jr.
patent: D207794 (1967-05-01), Cherrington
patent: 4190960 (1980-03-01), Warner
Dietzgen, Protractor Scale and Rules, 1946, p. 275.
Visual Systems, Scales, 86/87, pp. 196, 195.

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