US PATENT SUBCLASS 33 / 27.08
.~.~ Conic section

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

18.1  DF  SCRIBER {10}
27.01  DF  .~ Curved line {13}
27.08.~.~ Conic section

DEFINITION

Classification: 33/27.08

Conic section:

(under subclass 27.01) Subject matter wherein the curved line is produced by the intersection of a plane with a right circular cone and is not provided for elsewhere.