US PATENT SUBCLASS 33 / 459
.~.~.~ Two straightedges pivoted at the ends of a central straightedge

Current as of: June, 1999
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33 /   HD   GEOMETRICAL INSTRUMENTS

403  DF  STRAIGHTEDGE TYPE {16}
452  DF  .~ Plural straightedges, relatively moveable {6}
456  DF  .~.~ Multipivoted straightedges {3}
459.~.~.~ Two straightedges pivoted at the ends of a central straightedge {3}
460  DF  .~.~.~.~> At least one pivot is sliding {1}
462  DF  .~.~.~.~> Central straightedge longitudinally adjustable
463  DF  .~.~.~.~> Three straightedges forming a triangle

DEFINITION

Classification: 33/459

Two straightedges pivoted at the ends of a central straightedge:

(under subclass 456) Subject matter comprising one straightedge having another straightedge adjustable at each of the extremities of the one straightedge.

(1) Note. The middle straightedge is generally the longest of the other two straightedges, while the outer straightedges are generally work contact edges.