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| All Patents in class 408/148 | |||||
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| Number | Date | Patentee | Title | Type | |
| 3,052,900 | Sep. 11, 1962 | H.H. van der Velden | Thread Length Control Device for Pipe Threaders | pipe threading machines | |
| 3,598,499 | Aug. 10, 1971 | J.A. Dillon, Jr. | Boring Head Assembly | boring heads | |