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| Patents for Wm. Greurn | |||||
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| Picture | Number | Date | Patentee | Title | |
 | 48,257 | Jun. 20, 1865 | C.E. Brown | Improvement in Calipers | |
 | 48,454 | Jun. 27, 1865 | S.L. Simpson | Improvement in Rulers | |
 | 49,710 | Sep. 05, 1865 | R.T. Burnett | Replacable Level Vials | |
 | 49,802 | Sep. 05, 1865 | B.F. St. John | Improvement in Pendulum Levels | |
 | 50,173 | Sep. 26, 1865 | S.A. Shurtleff | Improvement in Dividers | |