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| Patents for Hans H. van der Velden | |||||
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| Number | Date | Patentee | Title | Type | |
| 2,952,467 | Sep. 13, 1960 | H.H. van der Velden | Chuck | pipe threading machines | |
| 3,052,900 | Sep. 11, 1962 | H.H. van der Velden | Thread Length Control Device for Pipe Threaders | pipe threading machines | |