James W. Groff

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Classroom noise alarm

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

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Computer-assisted audio/visual teaching system

Education and demonstration – Cathode ray screen display and audio means
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Radio-controlled teaching device

Education and demonstration – Question or problem eliciting response – Response of plural examinees communicated to monitor or...
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Tamperproof classroom noise alarm

Communications: electrical – Condition responsive indicating system – Specific condition
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Telephone number coding device

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Profile ID: LFUS-PAI-P-818071

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