| http://www.w3.org/ns/prov#value | - For this purpose, the device of the invention has an air feed outlet opened to the inside of the face shield, an air intake opened to the atmosphere and communicating with the air feed outlet, feeding means including an electric motor and a fan for drawing in atmospheric air from the air intake and supplying the air to the air feed outlet, and air filter means for cleaning the air before the air i
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