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Instructional and testing apparatus with switch closure at two d

Education and demonstration – Question or problem eliciting response – Correctness of response indicated to examine by...
Patent

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Instructional apparatus

Education and demonstration – Question or problem eliciting response – Correctness of response indicated to examine by...
Patent

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Instructional apparatus with multiple types of feedback

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Patent

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Instructional device

Education and demonstration – Question or problem eliciting response – Correctness of response indicated to examine by...
Reexamination Certificate

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Interactive computer assisted multi-media biofeedback system

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Interactive educational display board

Education and demonstration – Question or problem eliciting response – Correctness of response indicated to examine by...
Reexamination Certificate

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Interactive group communication system

Education and demonstration – Question or problem eliciting response – Correctness of response indicated to examine by...
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Interactive story book using stickers and a method of teaching

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Invisible ink quiz game

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