US PATENT SUBCLASS 33 / 277
.~.~ Common viewpoint
Current as of:
June, 1999
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33 /
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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.