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| All Patents in class 72/51 | |||||
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| Number | Date | Patentee | Title | Type | |
| AI86 | Jan. 25, 1848 | N. Whitmore | Cop (spindle) tube | ||
| 924,828 | Jun. 15, 1909 | S.A. James, J.A. Pittman | Pipe Joining Machine | pipe making machines | |
| 1,064,956 | Jun. 17, 1913 | W.A. Bernard | Process For Forming Sheet Metal Handles | pliers | |
| 1,388,903 | Aug. 30, 1921 | F.H. Stolp | Tube Making Machine | metal bending machines | |
| 1,408,232 | Feb. 28, 1922 | F.H. Stolp | Method of Forming Sheet Metal | sheet metal | |