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Class Information
Number: 434/329
Name: Education and demonstration > Question or problem eliciting response > Correctness of response indicated to examine by self-operating or examinee actuated means > Involving fluid flow
Description: Subject matter wherein the correctness of the examinee"s response is revealed by means involving movement of a fluid.

Patents under this class:

Patent Number Title Of Patent Date Issued
4354845 Identification structure for games and educational use and for other use Oct. 19, 1982

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