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| All Patents in class 74/20 | |||||
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| Number | Date | Patentee | Title | Type | |
| 2,782,832 | Feb. 26, 1957 | R.M. Shaw, Jr. | Bending Machines | metal bending machines | |
| 2,925,018 | Feb. 16, 1960 | F. Zankl, J.G. Osburn, J.B. Lukey | Quill Retracting and Positioning Mechanism | milling machines | |