Boracic Acid as a Preservative. AN IMPROVED FREIGHT CAR. Compressed Air for Blast in Cupola Furnaces. Sending a Sopranos. Voice by Express. AN IMPROVED POWER TREADLE ATTACHMENT. AN IMPROVED TOOTHED WHEEL. HARTMANN'S FREIGHT CAR. REDINGTON'S TOOTHED WHEEL., scientific american, 1888-12-15
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