US PATENT SUBCLASS 33 / 251
.~.~ Having variable size sight aperture

Current as of: June, 1999
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227  DF  STRAIGHT-LINE LIGHT RAY TYPE {20}
233  DF  .~ Gun sight {9}
251.~.~ Having variable size sight aperture

DEFINITION

Classification: 33/251

(under subclass 233) Device provided with means permitting adjustment of the size of the sight opening.