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Sound illustrated book having page indicator circuit

Education and demonstration – Audio recording and visual means – Visual information in book form
Patent

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Sound-illustrated, bound book

Education and demonstration – Audio recording and visual means – Visual information in book form
Patent

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Sound-producing amusement or educational devices

Education and demonstration – Audio recording and visual means – Visual information in book form
Patent

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Synchronized combined sound and sight entertainment and educatio

Education and demonstration – Audio recording and visual means – Visual information in book form
Patent

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System and method for teaching a new language

Education and demonstration – Audio recording and visual means – Visual information in book form
Reexamination Certificate

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System for enhancing books with special paper

Education and demonstration – Audio recording and visual means – Visual information in book form
Reexamination Certificate

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