slurry blender machines for use in oil or gas well hydraulic fracturing operations; high-pressure pumps for use in oil or gas well hydraulic fracturing operations; oilfield production machines for extracting oil from geological layers and processing hydrocarbons; geotechnical drilling machines; structural and replacement parts for fluid ends for reciprocating pumps in the nature of pump components that circulate drilling fluid, fracking fluid or completion fluid, namely, valves for pumps, packing being mechanical seals, liners being mechanical seals; structural and replacement parts for positive displacement pumps in the nature of pump components that circulate drilling fluid, fracking fluid or completion fluid, namely, valves for pumps, mechanical seals; structural and replacement parts for drilling modules being parts for oilfield wellhead machines that circulate drilling fluid, fracking fluid or completion fluid, namely, valves for pumps, packing being mechanical seals, liners being mechanical seals, gate valves, ball valves, check valves, plug valves, globe valves, valve parts, seats being pipe fittings and flanges, pistons for drilling; parts of oilfield wellhead machines, namely, gate valves, ball valves, check valves, plug valves, globe valves, casing heads, tubing heads, casing spools, choke and manifold industrial pumps, pump and valve parts, pipe fittings and flanges; machines for connecting surface equipment to wellheads; well pressure monitoring systems