US PATENT SUBCLASS 33 / 437
.~.~ With guide or catch for T-square type

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

403  DF  STRAIGHTEDGE TYPE {16}
430  DF  .~ Base attached {8}
437.~.~ With guide or catch for T-square type

DEFINITION

Classification: 33/437

With guide or catch for T-square type:

(under subclass 430) Subject matter comprising means for maintaining the straightedge in positive rectilinear path relative to the base as it is moved along the edge of the supporting base.