Straightedge

Details Straightedge Straightedge

1986-07-09

1988-04-05

Haroian, Harry N.

Geometrical instruments

Straightedge type

Rules

33494, 33 1B, G01B 302

Patent

active

047349930

ABSTRACT:
A transparent straightedge with two L-shaped slots, a multiplicity of vertical and horizontal scales running adjacent to and parallel to the slots, and reference arrows. The L-shaped slots are exactly 90 degrees. Center reference scales in the center portion running vertically. The reference arrows line up with the slots. Opposing scales and center reference scales are all in alignment.

REFERENCES:
patent: 304245 (1984-08-01), Thomas
patent: 629078 (1899-07-01), Holz
patent: 1544327 (1925-06-01), Loewenthal
patent: 1660624 (1928-02-01), Musham
patent: 1708551 (1929-04-01), Nell
patent: 1751366 (1930-03-01), Shaub
patent: 4235022 (1980-11-01), Aldape
patent: 4345383 (1982-08-01), Corsette
patent: 4565006 (1986-01-01), Vouyouka

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