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| All Patents in class 29/726 | |||||
| Number | Date | Patentee | Title | Type | |
| 450,154 | Apr. 14, 1891 | J.J. Hogan | Improvements in Wrenches For Internal Nipples | wrenches | |
| 875,746 | Jan. 07, 1908 | F.H. Stolp | Machine for making Radiators | radiator forming machines | |
| 942,410 | Dec. 07, 1909 | H.L. Peterson | Pressing device for push-nipple radiators | plumber | |