G09B 1/32

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Patent/Pub #TitleFiling DateIssue/Publication DatePatent Owner
9997081 Audio demonstration kitMar 28, 14Jun 12, 18Bose Corporation
9984583 Audio demonstration kitMar 28, 14May 29, 18Bose Corporation
9327184 Apparatus and method of manipulating numeric panelsDec 29, 11May 03, 16Not available
5011411 Method of making a non-repetitive modular designOct 31, 89Apr 30, 91Not available
4717342 Combinable set of quadratic elementsSep 30, 85Jan 05, 88Piky S. A.
4504236 Devices for displaying or performing operations in a two-valued systemDec 27, 82Mar 12, 85Not available
4498869 System for teaching visual discrimination of spatially oriented subject matterMar 12, 84Feb 12, 85Not available
4367066 Devices for displaying or performing operations in a two-valued systemJun 11, 81Jan 04, 83Not available
4273542 Devices for displaying or performing operations in a two-valued systemMay 31, 79Jun 16, 81Not available