| All Patents in class 72/390.6 |
Patents 1 -
7
of 7
      |
| Number | Date | Patentee | Title | Type |
| 152,695 | Jun. 30, 1874 | C. Scofield | Machines for Straightening Tubing Shafting &c. | metal straightening machines |
| 319,603 | Jun. 09, 1885 | W.J. Muncaster | Metal bending and straightening machine | metal straightening machines |
| 485,735 | Nov. 08, 1892 | H.F. Busking | Shaft Straightener | metal straightening machines |
| 525,003 | Aug. 28, 1894 | E. Hodgson, W. Copley | Straightening Machine for Shafting | metal straightening machines |
| 1,323,279 | Dec. 02, 1919 | F.O. Hoagland | Barrel Straightening Mechanism | metal straightening machines |
| 1,938,761 | Dec. 12, 1933 | H. Fritschi | Machine Tool | metal straightening machines |
| 2,214,881 | Sep. 17, 1940 | H.A. Doherty | Combination Straightening Block and Test Roll | metal straightening machines |
