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All Patents in class 285/401
Patents 1 - 3 of 3
First set of recordsLast set of records
NumberDatePatenteeTitleType
1,307,734Jun. 24, 1919A.V. GullborgLubricating Meansoil cups
1,679,825Aug. 07, 1928R.J. Holmgreen, J.H. HolmgreenRotary Well Drilling Machinewell drilling machines
2,066,956Jan. 05, 1937G.H. WilliamsAutomatic Couplingoil well pumps
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