A DRILL TO FACILITATE BLASTING. A LOCOMOTIVE SPARK ARRESTER. Cement which Resists Acids. AN IMPROVED GATE VALVE. LUNKENHEIMER'S 'HANDY' GATE VALVE. AN IMPROVED FREIGHT CAR COUPLER. MARSHALL'S CAR COUPLER. A Gas and Smoke Helmet. HADLOCK'S SPARK ARRESTER, scientific american, 1891-05-23
A DRILL TO FACILITATE BLASTING. A LOCOMOTIVE SPARK ARRESTER. Cement which Resists Acids. AN IMPROVED GATE VALVE. LUNKENHEIMER'S 'HANDY' GATE VALVE. AN IMPROVED FREIGHT CAR COUPLER. MARSHALL'S CAR COUPLER. A Gas and Smoke Helmet. HADLOCK'S SPARK ARRESTER, scientific american, 1891-05-23
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