ELECTRICALLY-OPERATED VERSUS STEAM-DRIVEN MINE HOISTS. two direct-current_ motors of 500 volts pressure built THE SHAFT OP THE REEINPREIISSEN MINE., scientific american, 1904-06-04
ELECTRICALLY-OPERATED VERSUS STEAM-DRIVEN MINE HOISTS. two direct-current_ motors of 500 volts pressure built THE SHAFT OP THE REEINPREIISSEN MINE., scientific american, 1904-06-04
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