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Patents for John F. Dettmar
Patents 1 - 4 of 4
First set of recordsLast set of records
PictureNumberDatePatenteeTitle
137,765Apr. 15, 1873R. DudgeonImprovement in hydraulic jacks
550,702Dec. 03, 1895J. WeeksHydraulic jack
568,421Sep. 29, 1896J. WeeksDock and vessel leveling device
571,547Nov. 17, 1896J. WeeksHydraulic jack
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