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| Patents for B. Roi | |||||
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| Picture | Number | Date | Patentee | Title | |
 | 258,420 | May 23, 1882 | R. Hessel | Corkscrew | |
 | 370,461 | Sep. 27, 1887 | R. Fleck | Machine for making wood wool | |
 | 379,301 | Mar. 13, 1888 | C. Wittkowsky | Method of manufacturing wooden relief-plates | |
 | 412,228 | Oct. 08, 1889 | F. Küppermann, A. Altmann | Petroleum Motor | |