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| All Patents in class 451/389 | |||||
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| Number | Date | Patentee | Title | Type | |
| 172,589 | Jan. 25, 1876 | H.D. Stover | Improvement in machines for cutting precious stones | ||
| 175,262 | Mar. 28, 1876 | H.D. Stover | Improvement in machines for polishing diamonds, &c. | ||
| 1,254,071 | Jan. 22, 1918 | W.F. Reinlie | Chuck | ||
| 2,394,242 | Feb. 05, 1946 | F.C. Jearum | Dop or Holder for Diamonds and Like Tool Pieces for Grinding or Polishing Purposes | jeweler | |