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| All Patents in class 122/250R | |||||
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| Number | Date | Patentee | Title | Type | |
| 263,954 | Sep. 05, 1882 | F.D. Pierce | Steam Generator for Road Vehicles or Other Purposes | steam generators | |
| 540,757 | Jun. 11, 1895 | F.W. Ofeldt | Vapor Engine | internal combustion engines | |