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| Patents for Karl O. Muehlberg | |||||
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| Picture | Number | Date | Patentee | Title | |
| 663,455 | Dec. 11, 1900 | K.O. Muehlberg | Cutter Tool | ||
 | 694,774 | Mar. 04, 1902 | K.O. Muehlberg | Center Square | |
| 728,276 | May 19, 1903 | K.O. Muehlberg | Drill Chuck | ||