Universal triangle

Details Universal triangle Universal triangle

1985-10-01

1986-12-02

Little, Willis

Geometrical instruments

Straightedge type

Plural straightedges nonadjustably fixed at right angles

33565, B44D 330

Patent

active

046254250

ABSTRACT:
This invention is a drafting implement consisting of an interchangeable triangle and interchangeable circular disk carried rotatively on the triangle and both the triangle and circular disk each being imprinted and having measurement and drafting aids to make technical drawings and measurements.

REFERENCES:
patent: 413497 (1889-10-01), De Puy
patent: 1349455 (1920-08-01), Henriksen
patent: 2560736 (1951-07-01), Olson
patent: 2836892 (1958-06-01), Nisenson
patent: 3947969 (1976-04-01), Martinez

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