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Keywords:
VENTILATORS,
CENTRIFUGAL,
MINES,
VACUUM,
AIR,
CURRENTS,
RESISTANCE,
EFFICIENCY,
VENTILATION,
MINING,
FANS,
MECHANICAL,
COLLIERIES,
EXPERIMENTS,
MANOMETRIC,
BESSEGES,
GARD,
FRANCE,
EUROPE
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© Thomas Telford and ICE
1881
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