Improved tri-square protractor

Details Improved tri-square protractor Improved tri-square protractor

G - Physics

01

B

G01B 3/00 (2006.01) G01B 5/08 (2006.01)

Patent

CA 2068311

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.

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