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Keywords:
ELECTRIC,
MINING,
MACHINERY,
APPLICATIONS,
ELECTRICITY,
COAL,
CUTTING,
PUMPING,
ROCKS,
DRILLING,
POWER,
MINES,
PUMPS,
EXPERIMENTS,
COMPRESSED,
AIR,
EXPLOSIONS,
SAFETY,
ARMATURES,
MOTORS,
DYNAMOS,
GEARS,
BORING,
PLANT,
ROTARY,
PERCUSSIVE,
TRANSMISSION,
CUTTERS,
DRILLS,
SPARKING,
SPARKS,
IGNITION,
VENTILATION,
COSTS,
ECONOMICS
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© Thomas Telford and ICE
1891
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