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