US PATENT SUBCLASS 359 / 890
.~ Superimposed or series

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

885  DF  ABSORPTION FILTER {7}
890.~ Superimposed or series

DEFINITION

Classification: 359/890

Superimposed or series:

(under subclass 885) Subject matter wherein two or more filters are disposed so that ray energy may pass through all the filters in series.