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| All Patents in class 72/52 | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,184,947 | May 30, 1916 | J.A. Gossett, J.C. Hewitt | Pipe-forming machine | pipe making machines | |
| 1,327,641 | Jan. 13, 1920 | F.H. Stolp | Machine for Folding Metal Tubes | metal bending machines | |