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| Patents for Howard Greene | |||||
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| Number | Date | Patentee | Title | Type | |
| 323,723 | Aug. 04, 1885 | E.H. Parks | Boring Machine | metalworking machines | |
| 343,846 | Jun. 15, 1886 | C.H. Phillips | Milling Machine | milling machines | |
| 366,651 | Jul. 19, 1887 | S. Darling | Bevel & Protractor | protractors | |
| 371,740 | Oct. 18, 1887 | S. Darling | Center Square | bevel squares | |