US PATENT SUBCLASS 33 / 429
.~ Square and fixed straightedge

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

403  DF  STRAIGHTEDGE TYPE {16}
429.~ Square and fixed straightedge

DEFINITION

Classification: 33/429

Square and fixed straightedge:

(under subclass 403) Subject matter comprising two straightedges connected to each other at angle of 90 deg. and

at least one other straightedge is immovably attached to the other two straightedges.