US PATENT SUBCLASS 33 / 422
.~.~ Having circumferential pivot, only

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

403  DF  STRAIGHTEDGE TYPE {16}
418  DF  .~ Square and pivoted straightedge {5}
422.~.~ Having circumferential pivot, only

DEFINITION

Classification: 33/422

Having circumferential pivot, only:

(under subclass 418) Subject matter wherein the straightedge can be rotated from its connected point in a circular manner.