| Patents for Ralph D. Gardner |
Patents 1 -
10
of 10
      |
| Number | Date | Patentee | Title | Type |
| 1,416,952 | May 23, 1922 | R.D. Gardner | Ring-grinding machine | |
| 1,465,762 | Aug. 21, 1923 | R.D. Gardner | Double-spindle disk grinder | disk sanders |
| 1,523,952 | Jan. 20, 1925 | J. Nielsen, R.D. Gardner, E.B. Gardner | Grinding machine | disk sanders |
| 1,563,901 | Dec. 01, 1925 | R.D. Gardner | Grinding machine | |
| 1,651,382 | Dec. 06, 1927 | R.D. Gardner, J. Nielsen, E.B. Gardner | Grinding machine | |
| 1,659,092 | Feb. 14, 1928 | E.B. Gardner | Ring-grinding machine | |
| 1,661,330 | Mar. 06, 1928 | R.D. Gardner, J. Nielsen, E.B. Gardner | Grinding machine | |
| 1,670,111 | May 15, 1928 | E.B. Gardner | Grinding machine | |
| 2,103,074 | Dec. 21, 1937 | R.D. Gardner | Clamping device | work holding |
| 2,107,566 | Feb. 08, 1938 | R.D. Gardner | Abrasive-sawing machine | metal sawing machines |
