US PATENT SUBCLASS 434 / 324
.~ Image projector included in examining means

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

322  DF  QUESTION OR PROBLEM ELICITING RESPONSE {8}
324.~ Image projector included in examining means {1}
325  DF  .~.~> And light detector

DEFINITION

Classification: 434/324

Image projector included in examining means:

(under subclass 322) Subject matter wherein the question or problem is projected by optical means from an image carrier onto a viewing screen.

(1) Note. Excluded from this subclass are devices wherein the question or problem is directly viewed through a magnifying lens.