US PATENT SUBCLASS 33 / 430
.~ Base attached

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

403  DF  STRAIGHTEDGE TYPE {16}
430.~ Base attached {8}
431  DF  .~.~> Navigation
432  DF  .~.~> Perspective drawing {2}
435  DF  .~.~> Rotary base
436  DF  .~.~> Linear counter rule
437  DF  .~.~> With guide or catch for T-square type
438  DF  .~.~> Universal parallelism arrangement {2}
443  DF  .~.~> Both ends connected {3}
447  DF  .~.~> Set shift, positively

DEFINITION

Classification: 33/430

Base attached:

(under subclass 403) Subject matter comprising a support upon which the straightedge device is attached.

(1) Note. If the straightedge and the base are both specially modified to engage with each other, the device is classified here, even though the straightedge may be easily removed from the base.