| http://www.w3.org/ns/prov#value | - ve wings are rotated at the same time, and a knob installed at either one of the respective wings; and an opening and shutting unit including a housing provided with a penetration hole which is installed at a rear of the main body, fixed to the cover, surrounding the main body, for penetrating the air, and having a central shaft formed at a center thereof, a rotational plate rotatably installed at
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