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All Patents in class 137/331
Patents 1 - 4 of 4
First set of recordsLast set of records
9,103Jul. 06, 1852E. RogersMode of Grinding Puppet-Valves While the Engine is in Motionsteam engine valves
1,470,974Oct. 16, 1923F. HardingeValveindustrial furnaces
1,546,580Jul. 21, 1925F. HardingeValveindustrial furnaces
1,619,470Mar. 01, 1927F. HardingeOil burning mechanismindustrial furnaces
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