AN IMPROVED PIPE-WRENCH. THE INGERSOLL PIPE-WRENCH. A NEW WICKLESS OIL BURNER. THE WENTWORTH COTTON-GIN. THE NEEDLE-VALVE AND ITS AUGER-STEM. THE WENTWORTH COTTON-0131. New Alkaloids o f' Tobacco. The Current Supplement. AN IMPROVED HYDROCARBON BURNER. Contents., scientific american, 1901-04-06
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