US PATENT SUBCLASS 33 / 434
.~.~.~ With parallel straightedge arrangement (i.e., drafting machine)

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

403  DF  STRAIGHTEDGE TYPE {16}
430  DF  .~ Base attached {8}
432  DF  .~.~ Perspective drawing {2}
434.~.~.~ With parallel straightedge arrangement (i.e., drafting machine)

DEFINITION

Classification: 33/434

With parallel straightedge arrangement (i.e., drafting machine):

(under subclass 432) Subject matter comprising a straightedge device which may be moved over the supporting base or surface with the ruling edge of the straightedge at all times in line with a vanishing point as relates to drawing perspectives.