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for the internal surface of a pipe
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Industry
CPC
E21B17/1007
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Parent Industries
E
FIXED CONSTRUCTIONS
E21
Mining
E21B
EARTH DRILLING
E21B17/00
Drilling rods or pipes Flexible drill strings Kellies Drill collars Sucker rods; Cables Casings Tubings
Current Industry
E21B17/1007
for the internal surface of a pipe
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