US PATENT SUBCLASS 33 / 27.09
.~.~ Spiral

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

18.1  DF  SCRIBER {10}
27.01  DF  .~ Curved line {13}
27.09.~.~ Spiral

DEFINITION

Classification: 33/27.09

Spiral:

(under subclass 27.01) Subject matter which includes a scribing member continuously circling about a point always increasing in size in a plane.