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| All Patents in class 72/31.12 | |||||
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| Number | Date | Patentee | Title | Type | |
| 821,765 | May 29, 1906 | E.W. Talmadge | Machine for Folding Sheet Metal | sheet metal bending machines | |
| 2,645,142 | Jul. 14, 1953 | O. Schwenzfeler | Spark Plug Adjusting Pliers | spark plug adjusting | |