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| All Patents in class 242/155R | |||||
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| Picture | Number | Date | Patentee | Title | |
 | 35,542 | Jun. 10, 1862 | P. Pryibil | Improved tension-regulator for sewing machines | |
 | 102,787 | May 10, 1870 | G.L. Du Laney | Improvement in tension-devices for thread in sewing-machines | |
| 2,320,264 | May 25, 1943 | P.E. Chapman, Sr. | Wire tensioning device | ||