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| Patents for George Kohlhaas | |||||
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| Number | Date | Patentee | Title | Type | |
| 857,810 | Jun. 25, 1907 | G. Kohlhaas | Hole Micrometer | measurement gauges | |
| 1,185,106 | May 30, 1916 | G. Kohlhaas | Tool Holder | tap and die holders | |