| http://www.w3.org/ns/prov#value | - A=kM and k is a constant, means 16, 17, 18 for automatically varying the volume per unit time V in response to the measured density D to provide a volume V or dry mass M per unit time which is preselected according to the value of D and/or means 16, 17, 18 for automatically varying the constant k in response to the measured density D. 2.
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