A windmill unit which can adjust air capacity to receive, and a wind power generation device using the windmill unit.
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The oscillating promotion structure of the faceplate in stringed instruments, such as a guitar.
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The ventilation opening tool for attaching to the ventilating hole of the wall which connects the outdoors and indoor.
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The ventilation opening tool attached to the ventilating hole which communicates indoor and the outdoors.
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The filtration technical aid which can do filtration work efficiently
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