Geometrical instruments – Straightedge type – Plural straightedges nonadjustably fixed at right angles
Patent
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
de Toledo Pamela
Senno Ricardo G.
Little Willis
Miller Richard L.
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