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| All Patents in class 91/347 | |||||
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| Number | Date | Patentee | Title | Type | |
| 407,338 | Jul. 23, 1889 | J.G. Downie | Steam Engine | steam engines | |
| 2,442,635 | Jun. 01, 1948 | R.D. Bennett | Spline or gear grinder | gear making machines | |