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| Patents for John Nielsen | |||||
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| Picture | Number | Date | Patentee | Title | |
| 1,523,952 | Jan. 20, 1925 | J. Nielsen, R.D. Gardner, E.B. Gardner | Grinding machine | ||
| 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 | ||