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| Patents for William Duffield | |||||
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| Number | Date | Patentee | Title | Type | |
| CA-1,064 | Jul. 15, 1871 | W. Duffield | Duffield's Steam Portable Cross Cut Sawing Machine | drag saws | |
| CA-19,015 | Jan. 01, 1884 | W. Duffield | Rotary steam engine | ||