SPRING LOCK. PHELPS' SPRING LOCK. LOCOMOTIVE BOILER CHECK VALVE. GLACE'S LOCOMOTIVE BOILER CHECK VALVE. HORSE COLLAR. A New Discovery of Natural Gas in Michigan. RUSH'S STEAM ENGINE. INSULATOR FOR ELECTRIC WIRES. LEONARDSON'S INSULATOR FOR ELECTRIC WIRES. SHEEHAN'S HORSE COLLAR., scientific american, 1886-09-18
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