7 Pumps for abstracting petroleum, machines for petroleum exploitation, namely, oil well pumping machines and machines for the petroleum refining industry, namely, oil well pumping machines, centrifugal pumps, centrifuges, pumps, namely, oil drain pumps, electric pumps, screw pumps, submersible pumps, and submersible screw pumps, lubricating pumps, hydraulic pumps, vacuum pumps