| Patents for Hartford Special Machinery Co. |
Patents 1 -
5
of 5
      |
| Number | Date | Patentee | Title | Type |
| 1,288,324 | Dec. 17, 1918 | D. Weir | Chuck | drill press chucks |
| 1,370,598 | Mar. 08, 1921 | D.H. Lapointe | Chuck | drill press chucks |
| 2,144,486 | Jan. 17, 1939 | E.M. Erb | Locating Device | milling machine accessories |
| GB-501,631 | Mar. 02, 1939 | E.M. Erb | Improvements in Indexing Devices for Chucks and Other Work Holders | milling machine accessories |
| 2,779,220 | Jan. 29, 1957 | O.L. Wright, Jr., R.J. Dunn, Jr. | Universal Drilling Machine | multiple spindle drill presses |
