4. Education and demonstration
  5. Mathematics
  6. Arithmetic

Ricardo Dreyfous

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Fraction circle

Education and demonstration – Mathematics – Arithmetic
Reexamination Certificate

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Teaching apparatus and method for visually representing mathemat

Education and demonstration – Mathematics – Arithmetic
Patent

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Teaching apparatus and method for visually representing mathemat

Education and demonstration – Mathematics – Arithmetic
Patent

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Teaching apparatus and method for visually representing polynomi

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

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