| http://www.w3.org/ns/prov#value | - A pneumatic conveyor system, comprising a main duct for the transport of objects between stations, a docking unit and valve means associated with each station, the valve means including a valve body first, second, third and fourth angularly spaced valve ports, a branch duct leading from the main duct to the first port, an exhauster for creating suction in the main duct connected with the second po
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