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| Patents for William E. Petri Jr. | |||||
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| Number | Date | Patentee | Title | Type | |
| 3,780,423 | Dec. 25, 1973 | C.E. Gilbert, Jr., W.E. Petri, Jr., T.F. Johnson, A.J. Lilienthal | Tool Changer | workpiece changers and storage mechanisms | |