U.S. federal trademark · Serial No. 72338603 · Reg. No. 0932432
WEIGHT MATERIAL FOR ADDITION TO WELL DRILLING FLUIDS
OIL BASE DRILLING FLUIDS AND POWDERED ASPHALTOUS COMPOSITIONS AND MIXING OILS FOR WELL DRILLING FLUIDS
CHEMICAL ADDITIVES FOR OIL BASE AND WATER BASE DRILLING FLUIDS INCLUDING EMULSIFIERS AD THINNER ADDITIVES FOR SUCH FLUIDS
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