Mine Conveyance Safety Dogs

IN the past four years Ontario Mines have made great progress in the development of reliable mine conveyance safety dogs. History shows that, prior to 1945, a rope failure on a descending conveyance was usually followed by unsatisfactory safety dog operation.
Keywords: Arthur, Ontario, bell crank, drawbar, failure, free-fall, conveyance, Conveyances, Mine, Mines, Rope, Ropes, Safety, test, Tests
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