| All Patents of Type: drill grinders |
Patents 1 -
13
of 13
      |
| 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 |
| 1,258,998 | Mar. 12, 1918 | J. Ditson | Drill Sharpener | drill grinders |
| 2,142,923 | Jan. 03, 1939 | R.P. Stocking | Drill grinding machine | drill grinders |
| 2,147,227 | Feb. 14, 1939 | G.B. Ambler | Drill sharpening machine | drill sharpening machines |
