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Coal
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Coal mines and mining
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mining
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keywords:(Coal mines and mining)
Effects of treatment of goaf (strip packing or caving) on rock in immediate vicinity
Giant bucket wheel crawler excavator with carriage for 90-m height of cut
Dropbottom cars from autos serve Kanawha mines
Strip mine converts to automotive haulage
Tonnage raised by adoption of shuttle-car gathering
Automatic track-brake system for man-haulage
Underground photography as aid to accident prevention
Track brakes for man-riding vehicles
New "Torkret" auto-pneumatic stower
Prevention of accidents in collieries
Effect on railways of ground movements
Car transfer speeds rock gangway development
Evolution of truck haulage at Enos