| All Patents of Type: drill sharpening machines |
Patents 1 -
15
of 38
      |
| Number | Date | Patentee | Title | Type |
| 104,982 | Jul. 05, 1870 | S.A. Morse | Improvement in grinding-rest for twist-drills | drill grinders |
| 153,401 | Jul. 21, 1874 | C. Van Haagen | Improvement in machines for sharpening twist-drills | drill grinders |
| 270,366 | Jan. 09, 1883 | J.S. Bancroft, W.H. Thorne | Drill | drill sharpening machines |
| 388,784 | Aug. 28, 1888 | F. Mossberg | Twist-drill-grinding attachment | drill grinders |
| 389,095 | Sep. 04, 1888 | F. Mossberg | Twist-drill-grinding attachment | drill grinders |
| 411,845 | Oct. 01, 1889 | O.S. Walker | Drill-grinding machine | drill grinders |
| 425,839 | Apr. 15, 1890 | O.S. Walker | Twist-drill-grinding machine | drill grinders |
| 428,426 | May 20, 1890 | J.H. Storey, H.J. Bamford | Machine for grinding twist or other drills | drill grinders |
| 497,095 | May 09, 1893 | T. Hall | Drill-grinder | drill grinders |
| 614,092 | Nov. 15, 1898 | G.T. Eames | Drill-grinder | drill sharpening machines |
| 630,536 | Aug. 08, 1899 | L.S. Heald, J.N. Heald | Drill-grinding machine | drill grinders |
| 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 |
| 697,584 | Apr. 15, 1902 | H.P. White | Drill-grinding machine | drill grinders |
