Automatic Feedback Control System for an Oil and Gas Well, namely, a closed-loop system comprised of computer software, computer hardware, rotating control heads, drilling chokes, pressure sensors, temperature sensors, flow meters, and mud pumps, which measures flow rates of drilling fluid into and out of the well and other parameters and controls a choke in an outlet conduit in order to control flow rate of the well and borehole pressure to provide pressure balance control of the well

AIR POLLUTION CONTROL EQUIPMENT

LUBRICANTS-NAMELY, GEAR OIL AND GREASE

LUBRICATING AGENTS, LUBRICATING OILS, AND LUBRICATING GREASES FOR USE IN MOTOR VEHICLES AND HEAVY EQUIPMENT

LUBRICATING AGENTS, LUBRICATING OILS AND LUBRICATING GREASES