| All Patents in class 451/375 |
Patents 16 -
30
of 39
      |
| Number | Date | Patentee | Title | Type |
| 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 |
| 1,382,003 | Jun. 21, 1921 | H.W. Lightner | Drill-holder | drill sharpening machines |
| 1,391,034 | Sep. 20, 1921 | A. Williams | Drill-holder | drill sharpening machines |
| 2,040,978 | May 19, 1936 | S.A. Cogsdill | Device for Loading Tools in Holders | metalworking machine tool holders |
| 2,080,515 | May 18, 1937 | H.E. Tautz | Drill grinding apparatus | |
| 2,119,741 | Jun. 07, 1938 | W.H. Fischer | Drill Grinding Tool | 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 |
| 2,152,729 | Apr. 04, 1939 | C.C. Chartier | Universal Tool Sharpening and Work Holder | sharpening tool holders |
| 2,389,679 | Nov. 27, 1945 | J. Michelson | Drill Sharpening Device | drill accessories |
| 2,401,471 | Jun. 04, 1946 | H.E. Fendring | Drill Grinder | woodworking machine sharpening mechanisms |
| 2,415,121 | Feb. 04, 1947 | H.V. Boehnke, C.A. Wiken | Drill grinder | cutter grinding |
| 2,460,078 | Jan. 25, 1949 | J.D. Faudree | Work Holder for Tool Grinders | sharpening tool holders |
