US PATENT SUBCLASS 33 / 277
.~.~ Common viewpoint


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

227  DF  STRAIGHT-LINE LIGHT RAY TYPE {20}
276  DF  .~ Multisight line {2}
277.~.~ Common viewpoint


DEFINITION

Classification: 33/277

(under subclass 276) Device in which the different lines of sight are taken from the same sight directing means.