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| Patents for Ludwig Swanson | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,300,042 | Apr. 08, 1919 | L. Swanson | Tool Holder | drilling and boring tool holders | |
| 1,506,034 | Aug. 26, 1924 | L. Swanson | Boring Tool Holder | drilling and boring tool holders | |