US PATENT SUBCLASS 359 / 513
.~ Sealing

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

507  DF  PROTECTION FROM MOISTURE OR FOREIGN PARTICLE {6}
513.~ Sealing {1}
514  DF  .~.~> Mirror, prism or signal reflector

DEFINITION

Classification: 359/513

Sealing:

(under subclass 507) Subject matter with means to seal the optical elements from the atmosphere so that dust or moisture, etc., does not fall on them.