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| All Patents in class 81/486 | |||||
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| Number | Date | Patentee | Title | Type | |
| 854,860 | May 28, 1907 | C.F. Weeber | Tool For Removing Engine Valves | valve spring tools | |
| 1,220,547 | Mar. 27, 1917 | A. Placek | Valve Spring Lifter | valve spring tools | |
| 1,234,967 | Jul. 31, 1917 | C.O. Throp | Valve Removing Tool | valve spring tools | |