Synonyme wurden verwendet für:
Coal mines and mining
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keywords:("Coal mines and mining")
Car handling at Savil Colliery
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
Track brakes for man-riding vehicles
New "Torkret" auto-pneumatic stower
The Tilmanstone aerial ropeway
Prevention of accidents in collieries
Efficient use of railway wagons
Effect on railways of ground movements
Car transfer speeds rock gangway development
Evolution of truck haulage at Enos