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| Patents for B. D. Hall | |||||
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| Picture | Number | Date | Patentee | Title | |
 | 232,821 | Oct. 05, 1880 | B. Holly | Steam Heating Radiator | |
 | 241,217 | May 10, 1881 | B. Holly | Meter | |
 | RE9,730 | May 31, 1881 | B. Holly | Street-Main | |
 | 246,952 | Sep. 13, 1881 | B. Holly | Steam Pressure Regulator | |
 | 260,097 | Jun. 27, 1882 | B. Holly | Apparatus for Supplying Steam | |