US PATENT SUBCLASS 33 / 438
.~.~ Universal parallelism arrangement

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

403  DF  STRAIGHTEDGE TYPE {16}
430  DF  .~ Base attached {8}
438.~.~ Universal parallelism arrangement {2}
439  DF  .~.~.~> Wheel and band {1}
441  DF  .~.~.~> Double linkage {1}

DEFINITION

Classification: 33/438

Universal parallelism arrangement:

(under subclass 430) Subject matter wherein the straightedge device is so attached to the base for movement that it may be set for movement in any one direction relative to the base

and moved over all portions of the surface of the base in that direction.