^tUntliit ^mthm. May 8, 1886.] 291 AN IMPROVED PULVERIZES. A Use for Fire Damp, … ring, and the material is crushed by while the mines at the same time would HOWLAND'S IMPROVED PULVERIZES. be relieved of a very undesirable ten- the weight or pressure of ring on the ant. The coal mines of western Penn- upper roll and the weight of the lower sylvania are fairly free from fire…
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