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All Patents in class 266/104
Patents 1 - 2 of 2
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NumberDatePatenteeTitleType
453,162May 26, 1891E.E. RiesApparatus for Hardening and Tempering Steel and Ironheat treating machines
1,253,966Jan. 15, 1918F.W. HarrisProcess and Apparatus for Treating Drill Pipeoilfield machinery
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