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| All Patents in class 81/429 | |||||
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| Picture | Number | Date | Patentee | Title | |
| 3,460,408 | Aug. 12, 1969 | J.G. Raymond | Depth gauge | ||
 | 3,527,273 | Sep. 08, 1970 | R.C. Falter | Adjustable means of limiting driving depth with attachable nosepiece | |
 | 3,686,983 | Aug. 29, 1972 | A. Flagge | Torque applying and tension controlling device | |