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| Patents for R. H. St. John | |||||
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| Number | Date | Patentee | Title | Type | |
| 18,213 | Sep. 15, 1857 | R.H. St. John | Watchmakers' lathe | watchmakers lathes | |
| 23,406 | Mar. 29, 1859 | R.H. St. John | Watchmakers Lathe | watchmakers lathes | |