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| All Patents of Type: oil filters | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,644,728 | Oct. 11, 1927 | C.B. Jahnke | Oil Filter | oil filters | |
| 1,764,722 | Jun. 17, 1930 | F.G. Hobart | Oil Filter | oil filters | |