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| Patents for William L. Libby | |||||
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| Picture | Number | Date | Patentee | Title | |
| 1,776,633 | Sep. 23, 1930 | E. Huge, W.L. Libby | Interlocking Control Mechanism | ||
 | 1,972,595 | Sep. 04, 1934 | W.L. Libby | Automatic cut-off machine | |