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Keywords:
ELECTRICITY,
SUPPLY,
POWER,
MINES,
WINDING,
GEARS,
MOTORS,
LOADS,
COSTS,
MINING,
COAL,
MECHANICS,
SHAFTS,
ELECTRIC,
VARIATIONS,
COLLIERIES,
THREE PHASE,
UK,
GERMANY
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© Thomas Telford and ICE
1907
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