(under the class definition) Apparatus comprising a plurality of pumping units and control means to change the operating characteristics of one relative to another.
(1) Note. To be considered plural pumping units under this definition each unit must operate in or comprise a pumping chamber separate and distinct from the pumping chamber of another unit.
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5+, for plural pumps with a common inflow or outflow path and means to control the drive means for said pumps individually in response to a sensed condition in the common inflow or outflow line.
62, for a plurality of pumps which may act alternatively in series flow or parallel flow relationship.
250, and 251+, for multistage pumps with an interstage intake or discharge, respectively. 286+, for plural pumps with individual condition responsive control of at least one.
