AN IMPROVED SEWER VENTILATOR. WORTHINGTON'S SEWER VENTILATOR. THE AMERICAN PATENT POP SAFETY VALVE. A Horse Killed by Electricity. AN INDICATOR ATTACHMENT FOR PASSENGER ELEVATORS. HAYWARD'S INDICATOR FOR PASSENGER ELEVATORS. American Railways in Chili. THE AMERICAN PATENT POP SAFETY VALVE., scientific american, 1889-02-09
AN IMPROVED SEWER VENTILATOR. WORTHINGTON'S SEWER VENTILATOR. THE AMERICAN PATENT POP SAFETY VALVE. A Horse Killed by Electricity. AN INDICATOR ATTACHMENT FOR PASSENGER ELEVATORS. HAYWARD'S INDICATOR FOR PASSENGER ELEVATORS. American Railways in Chili. THE AMERICAN PATENT POP SAFETY VALVE., scientific american, 1889-02-09
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