| All Patents in class 451/381 |
Patents 1 -
7
of 7
      |
| Number | Date | Patentee | Title | Type |
| 17,960 | Aug. 11, 1857 | H. Dillaway | Making Glassware | |
| 122,920 | Jan. 23, 1872 | J.P. Simons | Improvement in Expanding Mandrels | mandrels and arbors |
| 163,217 | May 11, 1875 | P.B. Lawson | Expanding Mandrel | mandrels and arbors |
| 667,579 | Feb. 05, 1901 | A. Roemisch | Apparatus for Grinding and Smoothing Glass | |
| 1,976,109 | Oct. 09, 1934 | W.D. Archea | Grinding Machine | grinding machines |
| 2,535,199 | Dec. 26, 1950 | B.C. Day | Gear holding diaphragm chuck | grinders |
| 3,038,280 | Jun. 12, 1962 | W. Dralle | Internal Stock Divider | grinding attachments |
