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| Patents for G09B 3 - Manually- or mechanically-operated teaching appliances working with questions and answers (1,613) |
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| 05/10/1977 | US4021938 Answer scoring device | | 03/29/1977 | US4014113 Computation word builder | | 03/22/1977 | US4012849 Educational quiz and answer toy | | 01/18/1977 | US4003332 Information display device | | 01/11/1977 | US4002888 Test form for use with a test scoring apparatus | | 12/07/1976 | US3995381 Low visibility answer sheet and method of testing | | 11/09/1976 | US3990156 Constructed response method with invisible answer indicator to prevent cheating | | 10/19/1976 | US3986275 Apparatus for self-instruction | | 08/10/1976 | US3973331 Manual self-teaching apparatus | | 06/22/1976 | US3964176 Instructional apparatus with movable blank sheet | | 04/27/1976 | US3952426 Question and answer educational game with an answer control device | | 02/17/1976 | US3938993 Xerographic method for making a responsive answer system | | 01/06/1976 | US3930321 Question and answer game |
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