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Ion generating method and ion generator, and static eliminating method and static eliminator using this ion generating method
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Ion generating element, and ion generating apparatus equipped with it
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Scattered light type smoke sensor having light condensing means
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External electrode discharge lamp and its manufacturing method
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Labyrinth, scattered light type smoke detector, and its injection molding die
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Gas detector and gas detecting method
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Ion generator
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Photosensor radio tag and photosensor system with the photosensor radio tag
