7 Hydraulic, electric, fluid, water, and circulating, centrifugal pumps for general domestic, commercial, agricultural, marine, industrial, and public uses; pumping systems comprised of base and sole plates, ball bearings, metal grounding bushings, machine couplings, shaft couplings, mechanical discharge heads, engine gaskets, gear drives, motors other than for land vehicles, engines, pump impellers, pump impeller housings, propellers for machines, surge valves for pumps, calibration columns, pipe fittings and flanges, pump pipes, mechanical pump seals, wear rings, shafts for pumps, tubing stabilizers, valves for pumps, intermediate cases and bowls; pump assemblies, namely, hydraulic, electric, fluid, water, and circulating pump assemblies; and replacement parts for the aforesaid, namely, structural parts, and fittings for pumps, pumping systems, and pump assemblies as parts of machines; motors other than for land vehicles