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| Patents for Mower Knife Grinder Co. | |||||
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| Picture | Number | Date | Patentee | Title | |
 | 342,290 | May 18, 1886 | R. Dutton | Machine for Grinding Mowing Machine Knives | |
| CA-24,338 | Jun. 17, 1886 | R. Dutton | Machine for grinding mower-knives | ||
 | 359,964 | Mar. 22, 1887 | R. Dutton | Machine for grinding mower-knives | |
 | CA-26,397 | Apr. 05, 1887 | R. Dutton | Machine for grinding mower-knives | |
 | 395,615 | Jan. 01, 1889 | R. Dutton | Machine for grinding mower-knives | |
 | CA-32,970 | Dec. 02, 1889 | R. Dutton | Machine for grinding mower-knives | |