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| Patents for Frank Pretsch | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,407,478 | Feb. 21, 1922 | F. Pretsch | Tool Holder | lathe tool holders and tool posts | |
| 1,413,490 | Apr. 18, 1922 | F. Pretsch | Tool Holder | metalworking machine tool holders | |