| All Patents in class 33/388 |
Patents 16 -
30
of 59
      |
| Number | Date | Patentee | Title | Type |
| 242,357 | May 31, 1881 | P. Nolan | Railroad Track Gage | track gauges |
| 281,086 | Jul. 10, 1883 | S.H. Lemon | Spirit Level | spirit levels |
| 295,100 | Mar. 11, 1884 | S.H. Bellows | Combined Bevel and T-Square | protractors |
| 329,895 | Nov. 10, 1885 | C.M. Ferguson | Railway Track Gage, Level and Gradient | track gauges |
| 359,580 | Mar. 15, 1887 | W.C. Thatcher | Spirit Level | spirit levels |
| 391,717 | Oct. 23, 1888 | C.H. Miller | Spirit Level and Inclinometer | spirit levels |
| 414,372 | Nov. 05, 1889 | J. Brakeley | Spirit Level | levels |
| 426,696 | Apr. 29, 1890 | W.M. Washburn | Farmer's Level | clinometers |
| 444,196 | Jan. 06, 1891 | J.H. Parks | Clinometer or Slope Measurer | clinometers |
| 472,531 | Apr. 12, 1892 | H.R. Eshelman | Protractor | protractors |
| 479,803 | Aug. 02, 1892 | J.M. Haise | Grade Measure | clinometers |
| 505,445 | Sep. 26, 1893 | W.R. Dorton | Adjustable Spirit Level and Plumb Device | spirit levels |
| 531,931 | Jan. 01, 1895 | E.F. Hargrett | Leveling Instrument | inclinometers |
| 555,525 | Mar. 03, 1896 | W.W. Jeter, W.R. Payne | Track Gage | track gauges |
| 555,771 | Mar. 03, 1896 | E. Hohnbaum | Level | inclinometers |
