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| All Patents in class 29/DIG.90 | |||||
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| Number | Date | Patentee | Title | Type | |
| 194,962 | Sep. 11, 1877 | L. Field | Screw Cutting Machines | screw machines | |
| 299,433 | May 27, 1884 | A. Coventry, W.F. Smith | Machinery for Grinding or Sharpening Drills | drill grinders | |
| 329,105 | Oct. 27, 1885 | H. Voigt | Automatic Lathe | automatic lathes | |
| 987,589 | Mar. 21, 1911 | E.S. Mummert | Grinding Machine for Sharpening Edged Tools | sharpening machines | |