US PATENT SUBCLASS 33 / 20.2
.~.~ Course tracking


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}
20.2.~.~ Course tracking


DEFINITION

Classification: 33/20.2

Course tracking:

(under subclass 20.1) Subject matter wherein an observer, moving to a fixed distant point, establishes at various points in his movement a line of sight through the sighting means to the distant point to note with the scribing member points in the path of the observer to the distant point.