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| Patents for William Simpkin | |||||
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| Number | Date | Patentee | Title | Type | |
| 325,507 | Sep. 01, 1885 | J.M. Bond, A. Delaney | Saw-mill dog | sawmill dogs | |
| 348,832 | Sep. 07, 1886 | W. Simpkin, A. Delaney | Apparatus for the purification of gas | ||