Synonyme wurden verwendet für:
mining
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keywords:(mining)
The steam tractor hauling ore in Washington
Mule-back transportation of sectionalized machinery
Mineral resources on Kansas City, Mexico and Orient railway
Magmatic segregation in its relation to the genesis of certain ore-bodies
An automatic signal system for crossovers on underground railways operated by electric locomotives
The introduction of automobiles for mining work
South African rope and safety-catch commission
A means of securing main haulage roads and return airways of a mine otherwise than with timber