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| Patents for Olof N. Rikof | |||||
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| Picture | Number | Date | Patentee | Title | |
| 1,111,181 | Sep. 22, 1914 | O.N. Rikof | Tool Holder for Metal Turning Lathes | ||
| 2,160,369 | May 30, 1939 | O.N. Rikof | Tool Holder | ||