Synonyme wurden verwendet für:
Bergbau
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keywords:(Bergbau)
Mineral resources on Kansas City, Mexico and Orient railway
The introduction of automobiles for mining work
Comparison of horse and benzine-locomotive haulage
Mule-back transportation of sectionalized machinery
An automatic signal system for crossovers on underground railways operated by electric locomotives
Switches for underground electric locomotive traction
The steam tractor hauling ore in Washington