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All Patents in class 148/581
Patents 1 - 2 of 2
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NumberDatePatenteeTitleType
125,650Apr. 09, 1872J.A. WoodburyImprovement in Tempering Steel Railrod Railstrack and switches
2,867,556Jan. 06, 1959G.E. TegenMethod of Flame Hardeningheat treating machines
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