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| All Patents in class 477/20 | |||||
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| Number | Date | Patentee | Title | Type | |
| 2,529,067 | Nov. 07, 1950 | W.A. Gigger, G.B. Hirsch, A.F. Bennett | Gear Shift Control Mechanism | machine tool controls | |
| 2,884,801 | May 05, 1959 | R.M. Woytych | Automatic Positioning Device | horizontal boring mill attachments | |