Patent classifications
E
FIXED CONSTRUCTIONS
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E21
EARTH OR ROCK DRILLING; MINING
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E21B
EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
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19/00
Handling rods, casings, tubes or the like outside the borehole, e.g. in the derrick; Apparatus for feeding the rods or cables
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E21B19/16
Connecting or disconnecting pipe couplings or joints
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E21B19/165
Control or monitoring arrangements therefor
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E21B19/166
Arrangements of torque limiters or torque indicators
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