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| All Patents in class 403/341 | |||||
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| Picture | Number | Date | Patentee | Title | |
 | 139,876 | Jun. 17, 1873 | A.P. Daboll | Bit-stock head | |
 | 306,690 | Oct. 14, 1884 | R.D. Johnson | Bit-stock (chuck) | |
 | 315,079 | Apr. 07, 1885 | I.P. Shotts | Extension-Shank for Bits, &c. | |
| 500,153 | Jun. 27, 1893 | W.S. Parman | Bit-stock | ||
 | 1,059,132 | Apr. 15, 1913 | G.O. Leopold, T.J. Fegley | Bit storage handle for the North Bros. (e.g. 1530 & 1431) eggbeater drills. | |
| 1,285,651 | Nov. 26, 1918 | J.A. Eden, Jr. | Drill Machine | ||