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Teaching circumference instrument

Education and demonstration – Mathematics – Geometry – trigonometry – or physical mathematic model structure
Reexamination Certificate

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Teaching cylinder instrument

Education and demonstration – Mathematics – Arithmetic
Reexamination Certificate

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Teaching device having means producing a self-generated program

Education and demonstration – Mathematics – Arithmetic
Patent

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Teaching machine

Education and demonstration – Mathematics – Arithmetic
Patent

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Teaching system for enhancing the learning of sets of facts

Education and demonstration – Mathematics – Arithmetic
Patent

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Teaching tool with RF switching

Education and demonstration – Mathematics – Arithmetic
Patent

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Teaching wheels

Education and demonstration – Mathematics – Arithmetic
Patent

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Ten-frame subtraction system

Education and demonstration – Mathematics – Arithmetic
Reexamination Certificate

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Tetrahedron blocks capable of assembly into cubes and pyramids

Education and demonstration – Mathematics – Geometry – trigonometry – or physical mathematic model structure
Patent

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Tetrahedron blocks capable of assembly into cubes and pyramids

Education and demonstration – Mathematics – Geometry – trigonometry – or physical mathematic model structure
Patent

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Tetrahedron blocks capable of assembly into cubes and pyramids

Education and demonstration – Mathematics – Geometry – trigonometry – or physical mathematic model structure
Patent

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Three-dimensional teaching device

Education and demonstration – Mathematics – Arithmetic
Patent

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Time counter controlled electronic learning aid

Education and demonstration – Mathematics – Arithmetic
Patent

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Toy and teaching aid combination

Education and demonstration – Mathematics – Arithmetic
Patent

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Toy balance concept-developing device

Education and demonstration – Mathematics – Arithmetic
Patent

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Toy device for illustrating mathematics

Education and demonstration – Mathematics – Geometry – trigonometry – or physical mathematic model structure
Patent

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Trigonometry visualizers and method of making same

Education and demonstration – Mathematics – Geometry – trigonometry – or physical mathematic model structure
Patent

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Variable action quincunx pinplate

Education and demonstration – Mathematics
Patent

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Virtual polyhedra models

Education and demonstration – Mathematics – Geometry – trigonometry – or physical mathematic model structure
Patent

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Visual aid for teaching linear relationships

Education and demonstration – Mathematics – Geometry – trigonometry – or physical mathematic model structure
Patent

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