7 Centrifugal pumps; Power-operated oil field equipment, namely, shakers, chokes, degassers, dual mud gas separators, liquid extractors, and gas extractors; Oil field equipment, namely, vent lines; Oil-well pumping machines; Drilling machines and parts therefore; Slurry blender machines for use in oil or gas well hydraulic fracturing operations; Oil field equipment, namely, drilling rig mechanization machines and devices; Oil field equipment, namely, drilling rig mechanical handling machines and devices; Oil field production machines for extracting oil from geological layers and processing hydrocarbons