US PATENT SUBCLASS 359 / 667
.~.~ With gas


Current as of: June, 1999
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359 /   HD   OPTICS: SYSTEMS (INCLUDING COMMUNICATION) AND ELEMENTS

642  DF  LENS {32}
665  DF  .~ Fluid {2}
667.~.~ With gas


DEFINITION

Classification: 359/667

With gas:

(under subclass 665) Subject matter wherein the refractive material is a transparent gas.