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| All Patents in class 277/329 | |||||
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| Number | Date | Patentee | Title | Type | |
| 2,090,213 | Aug. 17, 1937 | L.K. Madely | Well Seal | gaskets and seals | |
| 2,267,183 | Dec. 23, 1941 | G.H. Williams | Stuffing Box | oil well pumps | |