| http://www.w3.org/ns/prov#value | - wherein a largest number, Y, for limiting said transient driving of said powder pump with still another unit driving time, which is carried out following said intermittent driving of said powder pump performed for X times with said arbitrary unit driving time, is determined by a relation X???60P/nT, where p is a number of rotor pitch, n is a number of rotor revolution (rpm), and T is said still an
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