Parallel-ruling straightedge

Details Parallel-ruling straightedge Parallel-ruling straightedge

1977-08-19

1982-07-20

Phillips, Charles E.

Geometrical instruments

Straightedge type

Base attached

33492, 33493, B43L 1302, B43L 700

Patent

active

043398812

ABSTRACT:
A parallel-ruling straightedge assembly having a base member adapted to be translated over a drafting surface, a first straightedge member of a transparent acrylic material extending along one longitudinal edge of the base member and adapted to provide a drawing edge, and a second edge member of metallic material extending along an opposing longitudinal edge of the base member and having an edge adapted to provide a guide for a cutting blade for use in stripping sheet material.

REFERENCES:
patent: 475741 (1892-05-01), Page
patent: 854325 (1907-05-01), Belcher
patent: 2102008 (1937-12-01), Klitsche
patent: 2234467 (1941-03-01), De Lisle
patent: 2256241 (1941-09-01), De Lisle
patent: 3328886 (1967-07-01), Barzee et al.
patent: 4007542 (1977-02-01), Bergendorff

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