Synonyme wurden verwendet für:
Bergbau
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keywords:(Bergbau)
The steam tractor hauling ore in Washington
A means of securing main haulage roads and return airways of a mine otherwise than with timber
Wirtschafts-statistisches Handbuch für Sowjetrußland
Gathering without animals locomotives or conveyors
With hand shoveling 10 tons per man and 26 tons per loader already attained
With mechanical loading, cars can be manipulated if face be well shot and trips available
A haulage system with gathering locomotives only
A haulage system with gathering locomotives only
Safety problems in coal mining
Montana. The colstrip operation in Montana
Stoping methods in Michigan copper lodes
Wholesale first-aid training reduces mining accidents