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| Patents for Gustav H. Hollm | |||||
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| Number | Date | Patentee | Title | Type | |
| 717,199 | Dec. 30, 1902 | G.H. Hollm | Tapping Fixture | tap and die holders | |
| 922,429 | May 18, 1909 | G.H. Hollm | Tool Holder Securing Device | lathe tool holders and tool posts | |