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| Patents for Carroll Knowles | |||||
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| Picture | Number | Date | Patentee | Title | |
| 1,405,922 | Feb. 07, 1922 | C. Knowles | Wheel Guard for Grinding Machines | ||
| 1,424,764 | Aug. 08, 1922 | C. Knowles | Surface Grinder | ||
| 1,560,697 | Nov. 10, 1925 | C. Knowles | Dressing Attachment for Veritcal Surface Grinders | ||
| 1,611,048 | Dec. 14, 1926 | C. Knowles | Back Rest for Cylindrical Grinders | ||