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| All Patents in class 403/300 | |||||
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| Picture | Number | Date | Patentee | Title | |
 | 162,874 | May 04, 1875 | W. Wells | Auger-Bit Extension | |
 | 1,412,469 | Apr. 11, 1922 | F.A. Jimerson | Fluid-actuated rotary tool | |
| 2,726,091 | Dec. 06, 1955 | L.P. Topar | Tool Holder | ||
| 2,896,955 | Jul. 28, 1959 | W.A. Treppard | Tool Holder and Tool Assembly | ||
| 3,603,624 | Sep. 07, 1971 | L.A. Attermeyer | Antibacklash Coupling | ||