US PATENT SUBCLASS 33 / 20.3
.~.~ Perspective view tracing

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

18.1  DF  SCRIBER {10}
20.1  DF  .~ Sight-line controlled {3}
20.3.~.~ Perspective view tracing

DEFINITION

Classification: 33/20.3

Perspective view tracing;

(under subclass 20.1) Subject matter wherein the sighting means moving about a distant scene causes movement of the scribing member to duplicate the distant scene.