US PATENT SUBCLASS 33 / 242
.~.~ Critical material

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

227  DF  STRAIGHT-LINE LIGHT RAY TYPE {20}
233  DF  .~ Gun sight {9}
242.~.~ Critical material {1}
243  DF  .~.~.~> Colored

DEFINITION

Classification: 33/242

(under subclass 233) Device including a component having a particular color or being constructed of a specific material and wherein the performance of its intended function is materially enhanced by the use of such color or material.