| All Patents in class 408/211 |
Patents 1 -
13
of 13
      |
| Number | Date | Patentee | Title | Type |
| 10,744 | Apr. 04, 1854 | A. Pease | Drill for metal gun-barrels | drill bits |
| 47,812 | May 23, 1865 | W.W. Grier, R.H. Boyd | Improved drill-bit | drill bits |
| 125,759 | Apr. 16, 1872 | W.H. Richards | Center-Bit Style Countersink | countersinks |
| 228,421 | Jun. 01, 1880 | L. Thuston | "Brad-Point" Bit | twist drill bits |
| 504,018 | Aug. 29, 1893 | W. Caldwell | Point for Augers | auger bits |
| 631,572 | Aug. 22, 1899 | L. Judson | Countersink Attachment | countersinks |
| 679,406 | Jul. 30, 1901 | A.W. Watson | Drill | drill bits |
| 1,275,889 | Aug. 13, 1918 | E.J. Flander | Bit With Detachable/Interchangable Cutters | adjustable drill bits |
| 1,884,460 | Oct. 25, 1932 | J.H. Williams | Facing Tool | facing heads |
| 2,600,286 | Jun. 10, 1952 | C.H. Weiland | Drill bit | drill bits |
| 2,689,131 | Sep. 14, 1954 | D.E. Priest | Screwdriver with removable blade | screwdriver blades |
| 2,752,965 | Jul. 03, 1956 | B.A. Mackey | Drill bit construction | wood drill bits |
| 2,794,468 | Jun. 04, 1957 | R.W. Huxtable | Woodcutting bit assembly | wood drill bits |
