(under subclass 244) Apparatus in which in addition to the pump fluid intake to the prior stage and discharge from the subsequent stage there is provided (1) means in the fluid flow path intermediate the stages whereby pump fluid which was acted upon by the prior stage may be discharged without being acted upon by the subsequent stage or (2) means to permit discharge of pump fluid directly from the prior stage without being acted upon by the subsequent stage.
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242, for a controlled bypass between plural pump chambers which is in addition to the normal inlet flow paths to the chambers.
