| All Patents in class 451/292 |
Patents 1 -
15
of 16
      |
| Number | Date | Patentee | Title | Type |
| 938,803 | Nov. 02, 1909 | C.E. Van Norman | Metal-working machinery | cylindrical grinders |
| 1,203,844 | Nov. 07, 1916 | A.C. Page, C. Booth | Grinding Machine | grinding machines |
| 1,263,057 | Apr. 16, 1918 | J.T. Griffin | Mica Grinding Machine | |
| 1,264,928 | May 07, 1918 | L.R. Heim | Device for Feeding Rolls for End Grinding | |
| 1,519,611 | Dec. 16, 1924 | F.E. Gardner | Grinding machine | disk sanders |
| 1,523,952 | Jan. 20, 1925 | J. Nielsen, R.D. Gardner, E.B. Gardner | Grinding machine | disk sanders |
| 1,530,488 | Mar. 24, 1925 | F.E. Gardner | Grinding machine | disk sanders |
| 1,531,282 | Mar. 31, 1925 | F.E. Gardner | Grinding machine | disk sanders |
| 1,548,562 | Aug. 04, 1925 | H.K. Spencer | Means For And Method Of Handling Work Pieces | magnetic chucks |
| 1,548,563 | Aug. 04, 1925 | H.K. Spencer | Means For Handling Articles | grinding attachments |
| 1,576,820 | Mar. 16, 1926 | F.E. Gardner | Grinding machine | disk sanders |
| 1,651,382 | Dec. 06, 1927 | R.D. Gardner, J. Nielsen, E.B. Gardner | Grinding machine | |
| 1,689,176 | Oct. 23, 1928 | H.K. Spencer | Grinding Machine | surface grinders |
| 1,909,614 | May 16, 1933 | E.B. Gardner | Rotary grinding machine | |
| 2,105,872 | Jan. 18, 1938 | A.L. Warner | Grinding machine | sharpeners |
