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| All Patents in class 72/368 | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,408,232 | Feb. 28, 1922 | F.H. Stolp | Method of Forming Sheet Metal | sheet metal | |
| 2,977,824 | Apr. 04, 1961 | T.O. Rueb | Wrench Making Method | making wrenches | |