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| Patents for Howard M. Du Bois | |||||
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| Picture | Number | Date | Patentee | Title | |
| 165,800 | Jul. 20, 1875 | H.M. Du Bois, S.H. Davis, Jr. | Lubricator | ||
 | 179,167 | Jun. 27, 1876 | H.M. Du Bois | Improvement in polishing-machines | |