The windmill and wind power generation device which can function on a downwind type windmill also as a vertical-axis type windmill
[Detail]
The decoration costume made of origami which makes the kimono of Japanese clothes.
[Detail]
The ventilation opening tool attached to the ventilating hole which communicates indoor and the outdoors.
[Detail]
The rotation windmill which rotates in the fixed direction.
[Detail]
The organic-waste-water processing method useful also to the waste water treatment which contains an organic matter in high concentration.
[Detail]
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