| http://www.w3.org/ns/prov#value | - The operator can readily compensate for factors such as viscosity of the liquid being skimmed, the amount of effluent leaving the sump or drain opening 28, changing conditions of operation when they occur during the course of a skimming operation, and different characteristics of skimming depending upon the types of liquid being skimmed and the general conditions in which the liquid is found.
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