US PATENT SUBCLASS 33 / 20.1
.~ Sight-line controlled

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

18.1  DF  SCRIBER {10}
20.1.~ Sight-line controlled {3}
20.2  DF  .~.~> Course tracking
20.3  DF  .~.~> Perspective view tracing
20.4  DF  .~.~> Stereoscopic mapping

DEFINITION

Classification: 33/20.1

Sight-line controlled:

(under subclass 18.1) Subject matter wherein the movement of a scribing member is controlled by sighting means between the eyes of an observer and distant point.