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| Patents for Augustus E. Ellinwood | |||||
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| Picture | Number | Date | Patentee | Title | |
 | 243,116 | Jun. 21, 1881 | A.E. Ellinwood | Optionally can function also to countersink the hole being drilled | |
 | 299,362 | May 27, 1884 | A.E. Ellinwood | Spring-loaded, specially shaped jaws will grip either straight-shanked or tapered bits. | |
| 318,970 | Jun. 02, 1885 | A.E. Ellinwood | Chuck | ||