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| All Patents in class 137/539 | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,697,217 | Jan. 01, 1929 | O.U. Zerk | Lubricant Fitting | lubricating accessories | |
| 1,900,385 | Mar. 07, 1933 | M. Kahr | Fuel Feeding Means | fuel pumps | |