US PATENT SUBCLASS 33 / 447
.~.~ Set shift, positively

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

403  DF  STRAIGHTEDGE TYPE {16}
430  DF  .~ Base attached {8}
447.~.~ Set shift, positively

DEFINITION

Classification: 33/447

Set shift, positively:

(under subclass 430) Subject matter comprising means for moving the straightedge device a predetermined increment along the surface of the support base.

SEE OR SEARCH THIS CLASS, SUBCLASS:

445, and 450, for devices for accurately advancing the straightedge over the work.