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| All Patents in class 434/348 | |||||
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| Number | Date | Patentee | Title | Type | |
| 3,097,435 | Jul. 16, 1963 | H. Goldschmidt | Self testing device | ||
| 3,181,252 | May 04, 1965 | H. Goldschmidt, A.B. Sanford | Teaching device (tutor toy) | ||
| 3,230,642 | Jan. 25, 1966 | H. Goldschmidt | Teaching and testing apparatus | ||