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Sequencing puzzle

Education and demonstration – Mathematics – Arithmetic
Patent

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Statistical sampling apparatus

Education and demonstration – Mathematics
Patent

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Statistical teaching apparatus

Education and demonstration – Mathematics
Patent

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Superimposed transparencies used in education

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

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Supplementary teaching instruments

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

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System and method for determining area of irregular or...

Education and demonstration – Mathematics – Arithmetic
Reexamination Certificate

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System and method of teaching and learning mathematics

Education and demonstration – Mathematics – Arithmetic
Reexamination Certificate

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System and method of teaching and learning mathematics

Education and demonstration – Mathematics – Arithmetic
Reexamination Certificate

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System for teaching children about the use of money

Education and demonstration – Mathematics
Reexamination Certificate

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System for teaching mathematics

Education and demonstration – Mathematics – Arithmetic
Reexamination Certificate

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System for teaching mathematics

Education and demonstration – Mathematics
Patent

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System for utilizing interactive blocks to teach arithmetic

Education and demonstration – Mathematics – Arithmetic
Patent

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System to teach, measure and rate learner knowledge of basic...

Education and demonstration – Mathematics – Arithmetic
Reexamination Certificate

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