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| Patents for Walter Allen | |||||
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| Number | Date | Patentee | Title | Type | |
| 278,918 | Jun. 05, 1883 | A.H. Emery | Machinery for testing the strength of metal | testing machines | |
| 282,339 | Jul. 31, 1883 | A.J. Manny | Cane Mill | sugar cane apparatus | |
| 362,981 | May 17, 1887 | F.E. Leslie | Tobacco Plug Extractor | tobacco machinery | |
| 432,529 | Jul. 22, 1890 | J. Hollingworth | Milling Machine | milling machines | |
| 441,675 | Dec. 02, 1890 | R.R. Lewis | Tailor's Measure | garment measuring tools | |
| 771,328 | Oct. 04, 1904 | C.N. Schooley | Tool | tap and die holders | |