US PATENT SUBCLASS 359 / 723
.~.~ With separate filter

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

642  DF  LENS {32}
722  DF  .~ Selective wavelength transmitting or blocking {1}
723.~.~ With separate filter

DEFINITION

Classification: 359/723

With separate filter:

(under subclass 722) Subject matter including a specific

differentiating structure distinct from the lens elements.