E21B

Watch

Stats

Description

EARTH OR ROCK DRILLING (mining, quarrying E21C; making shafts, driving galleries or tunnels E21D); OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS

Subclasses

Not Available
Subclass Title
1/00 Percussion drilling (drives used in the borehole E21B 4/00)
1/02 Percussion drilling (drives used in the borehole E21B 4/00) Surface drives for drop hammers, e.g. with a cable
1/04 Percussion drilling (drives used in the borehole E21B 4/00) Surface drives for drop hammers, e.g. with a cable Devices for reversing the movement of the rod or cable at the surface
1/12 Percussion drilling (drives used in the borehole E21B 4/00) with a reciprocating impulse member (E21B 1/02, E21B 1/38 take precedence)
1/14 Percussion drilling (drives used in the borehole E21B 4/00) with a reciprocating impulse member (E21B 1/02, E21B 1/38 take precedence) driven by a rotating mechanism

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