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| Patents for Jacob Kettner | |||||
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| Picture | Number | Date | Patentee | Title | |
 | 252,436 | Jan. 17, 1882 | S. Darling | Metallic Try Square | |
 | 287,420 | Oct. 30, 1883 | S. Darling | Micrometer | |
 | 289,512 | Dec. 04, 1883 | S. Darling | Graduated Measure of Length | |
 | 289,513 | Dec. 04, 1883 | S. Darling | Micrometer Gage | |
| 292,415 | Jan. 22, 1884 | S. Darling | Comparator | ||
| 370,379 | Sep. 27, 1887 | S. Darling | Pen Cleaner | ||