| http://www.w3.org/ns/prov#value | - The system for delivering raw material of claim 2 wherein the stationary plate and movable gate are positioned at the bottom end of said vertically fixed tube, the valve further including a rotatable ring at the top end of said vertically fixed tube, said rotatable ring and said movable gate being coaxial and being connected by axial posts so that the movable gate turns with turning of the rotatab
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