4. Education and demonstration
  5. Mathematics
  6. Arithmetic

Jack G. Sanford, Jr.

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Door security system

Closure fasteners – Extension link – Chain
Patent

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Educational card system

Education and demonstration – Mathematics – Arithmetic
Patent

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Intrusion detection alarming device

Communications: electrical – Condition responsive indicating system – Specific condition
Patent

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Intrusion detection device

Communications: electrical – Condition responsive indicating system – Specific condition
Patent

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Profile ID: LFUS-PAI-P-1336972

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