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| All Patents in class 408/241G | |||||
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| Picture | Number | Date | Patentee | Title | |
| 575,469 | Jan. 19, 1897 | E.F. Fancher | Center Templet | ||
 | 1,504,192 | Aug. 05, 1924 | W.R. Fox | Drilling-machine-oiling system | |
 | 1,510,219 | Sep. 30, 1924 | R.B. Harding | Auger Guide | |
| 1,659,978 | Feb. 21, 1928 | D.C. Klausmeyer | Telescopic Guard System for Drills | ||
| 3,824,890 | Jul. 23, 1974 | E.E. Johnson, W.D. Zettler | Chip Guard for Machine Tools | ||
 | 3,869,803 | Mar. 11, 1975 | M.E. Vaughan | Drill guide for enlarging engine valve stem guides | |