ALUMINUM—A FIELD FOR SCIENTIFIC EFFORT. THE VALUE AND USES OF WORN-OUT FILES. IMPORTANCE OF STUDYING CAUSE AND HINT TO INVENTORS. GREAT REDUCTION IN COST OF FOREIGN PATENTS. ' THE WHEEL., scientific american, 1868-05-16

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ALUMINUM—A FIELD FOR SCIENTIFIC EFFORT. THE VALUE AND USES OF WORN-OUT FILES. IMPORTANCE OF STUDYING CAUSE AND HINT TO INVENTORS. GREAT REDUCTION IN COST OF FOREIGN PATENTS. ' THE WHEEL., scientific american, 1868-05-16

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