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DIFF Subgroup
E21B 1/38

Hammer piston type, i.e. in which the tool bit or anvil is hit by an impulse member

Introduced: January 2000

Full Title

Percussion drilling > Hammer piston type, i.e. in which the tool bit or anvil is hit by an impulse member

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