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| Patents for J. F. Duby | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,365,468 | Jan. 11, 1921 | J.F. Duby | Valve Spring Lifter | valve spring tools | |
| CA-229,008 | Feb. 27, 1923 | J.F. Duby | Valve Spring Lifter | valve spring tools | |