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| Patents for Ivan J. Rahn | |||||
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| Number | Date | Patentee | Title | Type | |
| 2,601,630 | Jun. 24, 1952 | R.J. Rahn, I.J. Rahn | Angle block and method of manufacture | measuring tools | |
| 3,159,469 | Dec. 01, 1964 | R.J. Rahn, I.J. Rahn | Gradient temperature normalizer for surface plates or blocks | measuring tools | |