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| All Patents in class 409/96 | |||||
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| Picture | Number | Date | Patentee | Title | |
 | 2,169,159 | Aug. 08, 1939 | G. Müller | Means for Accurate Screw Cutting | |
| 2,622,485 | Dec. 23, 1952 | M.E. Martellotti | Automatic Line Tracking Machine | ||
| 2,891,115 | Jun. 16, 1959 | J.W. Hogan | Magnetic Transducer | ||