Rule protractor

Details Rule protractor Rule protractor

1974-08-26

1976-03-09

Aegerter, Richard E.

Geometrical instruments

Scriber

Curved line

33119, 33120, B43L 700

Patent

active

039422526

ABSTRACT:
A quadrant for use by draftsmen; the device consisting of two arms attached pivotally together at one end, and including degree calibration, so the angle between the arms is readily read, and the device including locking means whereby the angle between the arms can be maintained fixed.

REFERENCES:
patent: 843459 (1907-02-01), Humes
patent: 932907 (1909-08-01), Rydman
patent: 935860 (1909-10-01), Probst
patent: 940439 (1909-11-01), Dolph
patent: 1161761 (1915-11-01), Barker
patent: 1161961 (1915-11-01), Pearl
patent: 1840135 (1932-01-01), Schutt

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