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| Patents for R. M. Pierson | |||||
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| Number | Date | Patentee | Title | Type | |
| 667,853 | Feb. 12, 1901 | F.E. Sands | Pipe-Wrench | chain and strap wrenches | |
| 707,734 | Aug. 26, 1902 | J.L. Tyler | Mitering-machine | miter machines | |
| 741,292 | Oct. 13, 1903 | R.W. Bailey | Fine Adjustment for Protractors | protractors | |
| 861,283 | Jul. 30, 1907 | H.J. Hjorth | Wire Winding Tool | spring winding tools | |