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| Patents for Hartford Machine Screw Co. | |||||
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| Picture | Number | Date | Patentee | Title | |
 | 275,431 | Apr. 10, 1883 | C.M. Spencer | Metal Screw Machine | |
| 409,441 | Aug. 20, 1889 | G.E. Witherell | Machine for Dressing the Ends of Screw Blanks | ||
| 511,829 | Jan. 02, 1894 | G.E. Witherell | Turret Tool Machine | ||
| 578,802 | Mar. 16, 1897 | G.E. Witherell | Thread Cutter | ||
| 925,041 | Jun. 15, 1909 | E.R. Seward | Stop Motion for Metalworking Machines | ||