Chemicals for use in industry; chemical additives for use in oil field technology; polymers for use in oil-well servicing fluids, including drilling fluids; chemical fluid loss additives for drilling fluids such as used in hydrocarbon recovery; chemicals for use as cement additives; chemical preparations for use as corrosion inhibitors

Microprocessor Based Computer Controller Proportioning Variables of Time and Temperature

Hydraulic Control Mechanism for Checking Strike Speed of Air Cylinder Units