(under subclass 244) Apparatus including a plurality of individual pumping members or units each of which handles a portion only of the total fluid pumped (i.e., operate in parallel flow paths) and a further single pumping unit or member which acts upon the total fluid handled by said plurality of pumping members or units, the single pumping unit or member acting upon the fluid either prior or subsequent to its being acted upon by said plurality of pumping members or units.
(1) Note. A plurality of pumping members acting in a single expansible chamber are not considered to be parallel stages under this definition. However, a double acting pumping member is considered to be parallel stages under this definition.
