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      Knowledge is Power

      Scientific American June 19, 1897

      The Practice of the Combined Open Hearth Process of Messrs Bertrand & Thiel

      • By E. Bertrand on June 19, 1897

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      More in the June 19, 1897 issue of Scientific American
      • Curious Weapons
      • Gravitation Stamp Mills for Quartz Crushing
      • Patents!
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