| All Patents in class 408/213 |
Patents 46 -
60
of 81
      |
| Number | Date | Patentee | Title | Type |
| 400,659 | Apr. 02, 1889 | F.C. Gerard | Auger | auger bits |
| 413,316 | Oct. 22, 1889 | W.J. Dobson | Counterbore Auger Attachment | drill accessories |
| 415,988 | Nov. 26, 1889 | W.S. Whiting | Extension-bit | adjustable drill bits |
| 450,908 | Apr. 21, 1891 | L.A. De La Nux, W. Brede | Auger | 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 |
| 567,271 | Sep. 08, 1896 | J.S. Howard, W.B. Howard, Jr. | Auger Bit - Lubricating | auger bits |
| 624,439 | May 09, 1899 | A.L. Adams | Expansion-Bit | adjustable drill bits |
| 631,572 | Aug. 22, 1899 | L. Judson | Countersink Attachment | countersinks |
| 662,199 | Nov. 20, 1900 | J.P. Lavigne | Expansible Bit | adjustable drill bits |
| 703,576 | Jul. 01, 1902 | G. Hallenscheid | Twisted Auger | auger bits |
| 722,481 | Mar. 10, 1903 | J.C. Beyer | Extension Boring-Bit | adjustable drill bits |
| 762,099 | Jun. 07, 1904 | N. Sperry | Auger-Bit | auger bits |
