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| Patents for Christian E. Ruf | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,891,196 | Dec. 13, 1932 | C.E. Ruf, E.H. Aldeborgh | Combination Dial Indicator | ||
| 1,928,001 | Sep. 26, 1933 | L.G. Spealman, P.D. Ritchey, E.H. Aldeborgh, C.E. Ruf | Projection Indicator Measuring Instrument | ||
| 2,095,405 | Oct. 12, 1937 | C.E. Ruf, E.H. Aldeborgh | Bore Measuring Attachment for Dial Indicators | measurement gauges | |