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JPH11275032A
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Car radio receiver listening state investigation method and its system, and car radio receiver listening state measurement device thereof
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JPH11275608A
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Discriminating device for watched channel
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JPH11272287A
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Method and system for identifying piece of music
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JPH11122204A
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Broadcasting recognition system using sound signal, sound element generation device used for the same and broadcasting recognition device
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JPH11122203A
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Broadcast confirmation system, video source production device used for the system and broadcast confirmation device
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GB1411803A
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Television monitor system
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