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| Patents for Robert Gerlach | |||||
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| Number | Date | Patentee | Title | Type | |
| 855,765 | Jun. 04, 1907 | R. Gerlach | Punching and shearing machine | metal punching machines | |
| 855,766 | Jun. 04, 1907 | R. Gerlach | Shearing Machine | metal shearing machines | |