Tri-square protractor

Details Tri-square protractor Tri-square protractor

1991-09-16

1995-02-14

Will, Thomas B.

Geometrical instruments

Straightedge type

Square and pivoted straightedge

33424, 33426, 33480, B43L 712

Patent

active

053883390

ABSTRACT:
An improved combination square set is provided. It has a square head, a center head, a protractor head and a blade. The improvement is the blade which can be a grooved L-square rule, a grooved T-square rule, a grooved try square and a grooved flat straight rule, so that the improved combination square set can be used to measure and mark quadrants on round stock, the angle of a drill press table and angles on a flat board.

REFERENCES:
patent: 535223 (1895-03-01), Rowell
patent: 686891 (1901-11-01), Dunbar
patent: 798721 (1905-09-01), Wilson
patent: 813173 (1906-02-01), Realing
patent: 965312 (1910-07-01), Meeker
patent: 1337823 (1920-04-01), Crane
patent: 1657547 (1928-01-01), Paulson
patent: 2085461 (1937-06-01), Chafeee
patent: 2536378 (1951-01-01), Lee
patent: 3456353 (1969-07-01), Iams
patent: 4380872 (1983-04-01), Moran

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