Shale shaker machines, drill cuttings dryer machines, drying shaker machines, shaker screens and degasser machines used to remove solids from drilling fluids in order to optimize drilling efficiency and HSE performance, reduce fluid losses and reduce drilling costs; vibratory screen separators for use in the oil and gas field; cyclone separators and hydrocyclone separators for solids recovery in the oil and gas industry; sifting machines; screen panels for sifting machines; screw conveyors; machines and machine tools used in oil and gas well drilling applications, namely, mud gas separators, mud cleaners, desanders, desilters, mud hoppers, mud agitators, liquid gas separators; complete mud dredging machine systems comprising mud tanks, pumps, shakers, mud cleaners, desanders, desilters, vacuum degassers, mud hoppers, mud agitators, and liquid gas separators