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| All Patents in class 83/131 | |||||
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| Number | Date | Patentee | Title | Type | |
| 655,074 | Jul. 31, 1900 | E. Graves | Punching Machine | metal punching machines | |
| 4,646,599 | Mar. 03, 1987 | R.J. Benedict | Hydraulic Punch Press With Workpiece Stripper | punch presses | |