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| All Patents in class 235/107 | |||||
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| Picture | Number | Date | Patentee | Title | |
 | 37,755 | Feb. 24, 1863 | A.D. Hoffman | Improvement in Board-Measures | |
 | 165,659 | Jul. 20, 1875 | W.M. Bullock | Improvement in Registering Board-Rules | |
 | 3,181,252 | May 04, 1965 | H. Goldschmidt, A.B. Sanford | Teaching device (tutor toy) | |