| All Patents in class 408/195 |
Patents 46 -
60
of 70
      |
| Number | Date | Patentee | Title | Type |
| 458,091 | Aug. 18, 1891 | C. Beauchene | Expansion-Bit | adjustable drill bits |
| 476,614 | Jun. 07, 1892 | H.O. Davis | Adjustable Bit | adjustable drill bits |
| 509,667 | Nov. 28, 1893 | J.P. Lavigne | Expansible Bit | adjustable drill bits |
| 525,386 | Sep. 04, 1894 | E. Ford | Expansible bit | adjustable drill bits |
| 530,923 | Dec. 18, 1894 | R.H. Brown | Expansion-bit | adjustable 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 |
| 646,439 | Apr. 03, 1900 | J.P. Lavigne | Expansible Bit | adjustable drill bits |
| 662,199 | Nov. 20, 1900 | J.P. Lavigne | Expansible Bit | adjustable drill bits |
| 722,481 | Mar. 10, 1903 | J.C. Beyer | Extension Boring-Bit | adjustable drill bits |
| 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 |
| 825,479 | Jul. 10, 1906 | J.T. Parker | Adjustable Bit Attachment | drill accessories |
| 848,632 | Apr. 02, 1907 | G.T. Chafin | Bit | adjustable drill bits |
| 850,177 | Apr. 16, 1907 | J.T. Parker | Adjustable Auger Bit | adjustable drill bits |
