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PCE
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DIFF Subgroup
E21B 17/22

Rods or pipes with helical structure

Introduced: January 1980

Full Title

Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Casings; Tubings > Rods or pipes with helical structure

No child classifications to compare. This is a leaf node in both IPC and CPC.