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PCE
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DIFF Subgroup
E21B 17/043

with locking means

Introduced: September 1968

Full Title

Full titles differ between systems:

IPC:

Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Casings; Tubings > Couplings; Joints > between rod and bit, or between rod and rod > threaded > with locking means

CPC:

Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Casings; Tubings > Couplings; joints > between rod and bit or between rod and rod > Threaded > with locking means

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