284 GUTHRIE'S WATER INDICATOR FOR BOILERS. Improvement in Time Pieces. Dairyman's Assistant. Hydrogen Gas for Bingeing Cloth. Nystrom's Calculatiog Machine. Locks. Improvements in Ventilation., scientific american, 1852-05-22


284 GUTHRIE'S WATER INDICATOR FOR BOILERS. Improvement in Time Pieces. Dairyman's Assistant. Hydrogen Gas for Bingeing Cloth. Nystrom's Calculatiog Machine. Locks. Improvements in Ventilation., scientific american, 1852-05-22


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