| All Patents in class 451/210 |
Patents 1 -
6
of 6
      |
| Number | Date | Patentee | Title | Type |
| 253,778 | Feb. 14, 1882 | H.R. Sillman | Machine for making spools, &c. | spool or bobbin machines |
| 314,596 | Mar. 31, 1885 | E. May | Machine for the Manufacturing of Pearl Buttons | button making machinery |
| 562,268 | Jun. 16, 1896 | F. Ashton | Apparatus for Grinding Parallel Spindles Rods or Shafts | cylindrical grinders |
| 2,209,562 | Jul. 30, 1940 | J.C. Drader | Worm Element Lapping Machine | gear lapping machines |
| 2,245,654 | Jun. 17, 1941 | J.D. Rovick, J.C. Drader | Gear Lapping and Finishing Machine | gear lapping machines |
| 2,332,421 | Oct. 19, 1943 | E. Wildhaber | Method And Machine For Relieving Cutters | metal relieving machines |
