| http://www.w3.org/ns/prov#value | - The object of the invention is to provide arr air discharge valve `for blowing engines, which is simple inyconstruction,efficient in operation, and which is particularly adapted to operate under.' high-pressure and at valves 4. - high-Speeds. ' gviding an bndinaryflapfvalve with ,an initial set ayvayffrom' its seat so that the valve in closing will have van linrolling motion onA the seat, thereby
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