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Patents for Douglas, Rogers & Co.
Patents 1 - 4 of 4
First set of recordsLast set of records
NumberDatePatenteeTitleType
27,040Feb. 07, 1860F. DouglasImproved steam-trap
27,704Apr. 03, 1860F. DouglasImproved steam-trapsteam engines
39,799Sep. 08, 1863F. DouglasImprovement in governors for steam-enginessteam engine governors
39,800Sep. 08, 1863F. DouglasImprovement in skate-fasteningsexercise and sports equipment
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