| All Patents of Type: drill grinders |
Patents 1 -
15
of 22
      |
| Number | Date | Patentee | Title | Type |
| 508,268 | Nov. 07, 1893 | J.S. Bancroft | Machine for Sharpening Drills | drill grinders |
| 607,306 | Jul. 12, 1898 | O.S. Walker | Twist-drill-grinding machine | drill grinders |
| 613,127 | Oct. 25, 1898 | W. Eames | Twist Drill Grinder | drill grinders |
| 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 |
| 1,253,291 | Jan. 15, 1918 | W.A. Smith | Drill Sharpener | drill grinders |
| 1,253,292 | Jan. 15, 1918 | W.A. Smith | Dolly Mechanism for Drill Sharpeners | drill grinders |
| GB-112,879 | Jan. 31, 1918 | P. Hunt, H.W. Hunt, H. Hunt | New or improved construction of twist drill grooving and clearance grinding (or milling) machines | drill grinders |
| 1,258,998 | Mar. 12, 1918 | J. Ditson | Drill Sharpener | drill grinders |
| 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 |
