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Class Information
Number: 434/334
Name: Education and demonstration > Question or problem eliciting response > Correctness of response indicated to examine by self-operating or examinee actuated means > Hand-held element insertable to different depths in apertures respectively representing right and wrong answers
Description: Subject matter wherein a question or answer carrier has means (e.g., recesses, etc.) of differing depths, the degree of depth of manual insertion of an element into the carrier indicating the correctness of the examinee"s response (e.g., a recess associated with a correct answer choice being deeper than a recess associated with an incorrect answer choice).

Patents under this class:

Patent Number Title Of Patent Date Issued
6991509 Activity toy Jan. 31, 2006
4921427 Educational device May. 1, 1990
4576579 Instructional and testing apparatus with switch closure at two different depths Mar. 18, 1986
4453920 Instructional apparatus with multiple types of feedback Jun. 12, 1984
4449943 Teacher prepared formats for instructional apparatus May. 22, 1984
4065858 Instructional apparatus with elastic sheet Jan. 3, 1978
3973331 Manual self-teaching apparatus Aug. 10, 1976
3964176 Instructional apparatus with movable blank sheet Jun. 22, 1976
3930321 Question and answer game Jan. 6, 1976

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