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Preview A Light in the Darkness: U.S. Mine Lamps, the Early Years pdf file

ly for domestic purposes up to the seventeenth .... flame. Electronic gas detectors started to usurp the Wolf safety lamp's function as ... Rape- seed oil seems to have predominated in conti- nental European mines ..... L. Thwing, Flickering Flames (Rutland, VT: Charles E. .... turers in the Midwest required the nation's emerging.

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