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All Patents in class 451/116
Patents 1 - 7 of 7
First set of recordsLast set of records
PictureNumberDatePatenteeTitle
  223,507Jan. 13, 1880J.L. HaydenMachinery for Grinding Cocks
  237,784Feb. 15, 1881E.V. TannerMachine for Grinding Plug Valves
  370,160Sep. 20, 1887R.A. RegesterCock Grinding Machine
  430,142Jun. 17, 1890G.B. ChadwickMachine for Grinding Cocks Automatically
  480,258Aug. 09, 1892P. GerstenkornMachine for Grinding Cocks
  521,980Jun. 26, 1894C.M. JarvisMachine for Grinding Cocks Automatically
950,565Mar. 01, 1910F.W. CookeMachine for Grinding Valve Gage Seats
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