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Background reference level system and method for document scanners
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Timing system for optically scanned documents
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Computer-assisted instruction via video-telephone
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Air exhaust system for waste material
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Background reference level system and method for document scanners
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Analog multi-response tester
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TEACHING SYSTEM
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Computer-assisted instruction via video-telephone
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Electronic packaging unit and method
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Document handling apparatus
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Reflected light document reading head
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Document handling apparatus
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Document reader for reading data on both sides of a document
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Computer-assisted instruction via video telephone
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Code translation system
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Document-handling apparatus
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Answer system for teaching machines
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Answer system for teaching machines
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