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| Patents for Otto Lubkert | |||||
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| Number | Date | Patentee | Title | Type | |
| 373,293 | Nov. 15, 1887 | G. Eiserer, E. Jenner | Stroke-jointer | wood planers | |
| 409,743 | Aug. 27, 1889 | C. Gail | Box-blocker | box making machines | |