| All Patents in class 408/212 |
Patents 31 -
45
of 56
      |
| Number | Date | Patentee | Title | Type |
| 433,683 | Aug. 05, 1890 | S.H. Jennings | Auger-Bit | auger bits |
| 461,897 | Oct. 27, 1891 | E. Ford | Single-Twist Auger Bit | auger bits |
| 476,614 | Jun. 07, 1892 | H.O. Davis | Adjustable Bit | adjustable drill bits |
| 494,251 | Mar. 28, 1893 | W. Dodge | Auger Bit | auger bits |
| 509,667 | Nov. 28, 1893 | J.P. Lavigne | Expansible Bit | adjustable drill bits |
| 514,178 | Feb. 06, 1894 | A.A. Bourgeons | Adjustable Bit Attachment | drill accessories |
| 529,832 | Nov. 27, 1894 | E.C. Phillips | Bit With Replaceable Wood-Screw Lead | drill bits |
| 594,615 | Nov. 30, 1897 | B.H. Fowle | Expansive Bit | adjustable drill bits |
| 624,439 | May 09, 1899 | A.L. Adams | Expansion-Bit | adjustable drill bits |
| 631,572 | Aug. 22, 1899 | L. Judson | Countersink Attachment | countersinks |
| 646,439 | Apr. 03, 1900 | J.P. Lavigne | Expansible Bit | adjustable drill bits |
| 722,481 | Mar. 10, 1903 | J.C. Beyer | Extension Boring-Bit | adjustable drill bits |
| 772,211 | Oct. 11, 1904 | A.D. Campbell | Bit gage | |
| 787,664 | Apr. 18, 1905 | M.D. Converse | Boring-Tool | adjustable drill bits |
| 803,223 | Oct. 31, 1905 | T.F. Gaynor | Expansion-Auger | adjustable drill bits |
