US PATENT SUBCLASS 434 / 331
.~.~ By optical element (e.g., mirror, color filter, lens, etc.)

Current as of: June, 1999
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434 /   HD   EDUCATION AND DEMONSTRATION

322  DF  QUESTION OR PROBLEM ELICITING RESPONSE {8}
327  DF  .~ Correctness of response indicated to examine by self-operating or examinee actuated means {12}
331.~.~ By optical element (e.g., mirror, color filter, lens, etc.)

DEFINITION

Classification: 434/331

By optical element (e.g.., mirror, color filter, lens, etc.):

(under subclass 327) Subject matter wherein the correctness of an examinee's response is indicated by optical means.