Try square protractor

Details Try square protractor Try square protractor

1988-09-30

1989-06-06

Cuchlinski, Jr., William A.

Geometrical instruments

Straightedge type

Square and pivoted straightedge

33424, 33419, 33428, B43L 706

Patent

active

048358770

ABSTRACT:
A combined try square and protractor is structured to measure a right angle, to measure center of a pipe and to measure various angles therefrom.

REFERENCES:
patent: Re12119 (1903-06-01), Oehrle
patent: 798695 (1905-09-01), Oehrle
patent: 813173 (1906-02-01), Realing
patent: 842806 (1907-01-01), McCausland
patent: 1255158 (1918-02-01), Gronager
patent: 1523265 (1925-01-01), Hobbs
patent: 2113524 (1938-04-01), Wolfe
patent: 2308373 (1943-01-01), Keegan
patent: 2316189 (1943-04-01), Schaefer
patent: 2495841 (1950-01-01), Fink
patent: 2579768 (1951-12-01), Tefft

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