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| Patents for Ludwig Metzger | |||||
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| Number | Date | Patentee | Title | Type | |
| 403,956 | May 28, 1889 | L. Metzger, F. Pettge | Bung | auxiliary wrenches | |
| 413,681 | Oct. 29, 1889 | L. Metzger, F. Pettge | Bung | auxiliary wrenches | |