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| Patents for Leonard H. Hall | |||||
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| Picture | Number | Date | Patentee | Title | |
 | 181,334 | Aug. 22, 1876 | L.H. Hall | Improvement in balanced valves | |
 | 188,048 | Mar. 06, 1877 | L.H. Hall | Aligning a shaft while pouring Babbitt | |
 | 210,850 | Dec. 17, 1878 | L.H. Hall | Imprrovement in hoisting-machines | |
| RE9,095 | Feb. 24, 1880 | L.H. Hall | Hoisting-machine | ||