THE MARVIN ELECTRIC ROCK DRILL. Fig. 2LONI4TUDINAL SEC TION OF THE MARVIN ROCK DRILL. THE GENERATOR., scientific american, 1899-04-29

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THE MARVIN ELECTRIC ROCK DRILL. Fig. 2LONI4TUDINAL SEC TION OF THE MARVIN ROCK DRILL. THE GENERATOR., scientific american, 1899-04-29

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