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| Patents for Christian Eugene Ruf | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,774,157 | Aug. 26, 1930 | C.E. Ruf | Arm Attachment for Indicators | dial indicator attachments | |
| 1,937,936 | Dec. 05, 1933 | C.E. Ruf, E.H. Aldeborgh | Dial Indicator Gauge | ||