| All Patents in class 451/381 |
Patents 1 -
8
of 8
      |
| Picture | Number | Date | Patentee | Title |
 | 17,960 | Aug. 11, 1857 | H. Dillaway | Making Glassware |
| | 122,920 | Jan. 23, 1872 | J.P. Simons | Improvement in Expanding Mandrels |
| | 163,217 | May 11, 1875 | P.B. Lawson | Expanding Mandrel |
| | 667,579 | Feb. 05, 1901 | A. Roemisch | Apparatus for Grinding and Smoothing Glass |
| | 1,976,109 | Oct. 09, 1934 | W.D. Archea | Grinding Machine |
| | 2,000,216 | May 07, 1935 | G.A. Carlson | Grinding machine |
 | 2,535,199 | Dec. 26, 1950 | B.C. Day | Gear holding diaphragm chuck |
| | 3,038,280 | Jun. 12, 1962 | W. Dralle | Internal Stock Divider |
