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All Patents in class 285/401
Patents 1 - 2 of 2
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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
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