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Bergbau
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With hand shoveling 10 tons per man and 26 tons per loader already attained
Some notes on the bord-and-pillar system of work
With mechanical loading, cars can be manipulated if face be well shot and trips available
Gathering without animals locomotives or conveyors
Rational limits in use of motor trucks and railroad transportation in open pits of Noril'sk combine
Maximum range of railroad gradients in open pits
Economic and reliable systems of automatic control of underground transportation