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| All Patents of Type: cylinder gages | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,625,401 | Apr. 19, 1927 | R.J. Simpson | Cylinder Gauge | cylinder gages | |
| 1,847,906 | Mar. 01, 1932 | R.J. Simpson | Cylinder Gauge | cylinder gages | |