Geometrical instruments – Straightedge type – With means for moving straightedge over a surface
Patent
1990-09-24
1991-09-24
Cuchlinski, Jr., William A.
Geometrical instruments
Straightedge type
With means for moving straightedge over a surface
33 2703, B43L 1302
Patent
active
050503090
ABSTRACT:
A multipurpose ruler to permit a user to precisely draw geometric shapes as well as to store information including a housing having a rotatable roller with multiple information areas and an alignment mark to permit the user precisely align the ruler for accurately drawing geometric figures. A retractable pivot pin permits the user to draw circles about the pivot pin and a transparent housing permits a user to readily view information stored on the ruler.
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Popular Mechanics, Aug. 1949, p. 104.
Cuchlinski Jr. William A.
Wirthlin Alvin
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