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| All Patents in class 279/80 | |||||
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| Picture | Number | Date | Patentee | Title | |
 | 61,113 | Jan. 08, 1867 | A.W. Streeter | Improvement in bit-stocks | |
| 1,076,971 | Oct. 28, 1913 | C. Geiger | Tool Holder | ||
| 2,446,363 | Aug. 03, 1948 | E.W. Daum | Combination positive clutch and torque responsive friction coupling | ||