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ActiSystems, Inc. Canada, drilling fluids
Albemarle Corporation USA, oilfield chemicals
AllChem Industries USA, water treatment, petroleum additives and oilfield chemicals
Altivia USA, water treating chemicals
Anchor Drilling Fluids USA, Inc. USA; drilling fluids
Apex Engineering Products Corporation USA, scale removal chemicals
Aqua Chemicals (Singapore) Private Limited Singapore, oilfield and maintenance chemicals
Aqualon Oil Field Chemicals USA, water-soluble polymers for oil and gas drilling, workover and completion, cementing, and stimulation
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