US PATENT SUBCLASS 356 / 144
.~.~ With plural images

Current as of: June, 1999
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356 /   HD   OPTICS: MEASURING AND TESTING

138  DF  ANGLE MEASURING OR ANGULAR AXIAL ALIGNMENT {11}
140  DF  .~ Apex of angle at observing or detecting station {6}
144.~.~ With plural images {2}
145  DF  .~.~.~> Lines of sight relatively adjustable with two degrees of freedom
146  DF  .~.~.~> Two or more lines of sight deflected

DEFINITION

Classification: 356/144

(under subclass 140) Subject matter including means whereby an observer sees plural images of subject matter remote from the observer.

(1) Note. The images can, for example, be displaced images of the same subject matter or they can be superimposed images of different subject matter such as the horizon and a star.