| All Patents of Type: drill sharpening machines |
Patents 1 -
15
of 23
      |
| Number | Date | Patentee | Title | Type |
| 270,366 | Jan. 09, 1883 | W.H. Thorne, J.S. Bancroft | Drill | drill sharpening machines |
| 614,092 | Nov. 15, 1898 | G.T. Eames | Drill-grinder | drill sharpening machines |
| 643,703 | Feb. 20, 1900 | H.P. White | Drill-grinding machines | drill sharpening machines |
| 643,927 | Feb. 20, 1900 | O.S. Walker | Drill-grinder | drill sharpening machines |
| 684,890 | Oct. 22, 1901 | H.P. White | Drill-grinder | drill sharpening machines |
| 704,348 | Jul. 08, 1902 | J.N. Lapointe | Grinding-machine | drill sharpening machines |
| GB-122,735 | Feb. 06, 1919 | P. Hunt, H.W. Hunt, H. Hunt | Improvements in twist drill point grinding machines | drill grinders |
| FR-489,933 | Mar. 22, 1919 | H. Hunt, H.W. Hunt, P. Hunt | Machine for sharpening helicoidal drill tips | drill grinders |
| FR-495,289 | Oct. 03, 1919 | H. Hunt, H.W. Hunt, P. Hunt | Machine to groove and cut twist drills | drill grinders |
| 1,339,452 | May 11, 1920 | E.T. Gorham | Dressing-tool for grinding-wheels | grinder dressers |
| CA-209,162 | Mar. 08, 1921 | P. Hunt, H.W. Hunt, H. Hunt | Twist drill point grinding machine | drill grinders |
| 1,382,003 | Jun. 21, 1921 | H.W. Lightner | Drill-holder | drill sharpening machines |
| GB-168,634 | Sep. 08, 1921 | P. Hunt, H.W. Hunt, H. Hunt | Improvements in twist drill point grinding machines | drill grinders |
| 1,391,034 | Sep. 20, 1921 | A. Williams | Drill-holder | drill sharpening machines |
| FE-23,110 | Oct. 04, 1921 | H. Hunt, H.W. Hunt, P. Hunt | Machine to groove and cut twist drills | drill grinders |
