| http://www.w3.org/ns/prov#value | - In a fluid-actuated pump, a combination comprising at least one pumping unit including a pump chamber, a pumping piston received in said pumping chamber for reciprocation to one end position in a suction stroke and to another end position in a pumping stroke, and means for admitting a medium to be pumped into said pumping chamber during said suction stroke and for discharging the medium being pump
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