US PATENT SUBCLASS 359 / 673
.~.~ To the front of a basic lens

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

642  DF  LENS {32}
672  DF  .~ Selective magnification by exchanging or adding a lens component {3}
673.~.~ To the front of a basic lens

DEFINITION

Classification: 359/673

To the front of a basic lens:

(under subclass 672) Subject matter wherein a lens component is exchanged or added to the objective side (i.e., front) of a basic lens for selective magnification.