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| Patents for Rahn Granite Surface Plate Co. | |||||
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| Picture | Number | Date | Patentee | Title | |
 | 2,601,630 | Jun. 24, 1952 | R.J. Rahn, I.J. Rahn | Angle block and method of manufacture | |
 | 2,947,083 | Aug. 02, 1960 | R.J. Rahn | Surface plate calibration | |
 | 3,159,469 | Dec. 01, 1964 | R.J. Rahn, I.J. Rahn | Gradient temperature normalizer for surface plates or blocks | |
| 3,739,150 | Jun. 12, 1973 | R.J. Rahn | Granite Surface Plate With Controlled Heat | ||