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| All Patents in class 82/71 | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,166,456 | Jan. 04, 1916 | H.J. Hamer | Pipe-cutting machine | pipe cutting machines | |
| 2,596,062 | May 06, 1952 | N.D. Abbey | Tube cutting machine | tube cutting machines | |
| 2,616,325 | Nov. 04, 1952 | N.D. Abbey | Tube chamfering and cutoff mechanism | tube cutting machines | |