406 Improved Governor Valve. Improved Grate Bar. New Method of reducing Poor Lead Ores. CAR SPRINGS. WHITE'S GOVERNOR VALVE. LASHER'S GRATE BAR., scientific american, 1864-06-25

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406 Improved Governor Valve. Improved Grate Bar. New Method of reducing Poor Lead Ores. CAR SPRINGS. WHITE'S GOVERNOR VALVE. LASHER'S GRATE BAR., scientific american, 1864-06-25

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