| http://www.w3.org/ns/prov#value | - aid tube, said tube having an outlet at its lower end and an inlet at its upper end communicating with said pumping chamber, a floating valve element within said pumping chamber, and a seat for said valve element about said inlet, said valve element floating into seating engagement with said valve seat when the blood within said tube rises to the level of said inlet, said inlet including an inlet
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