| All Patents in class 33/350 |
Patents 1 -
15
of 15
      |
| Number | Date | Patentee | Title | Type |
| 100,463 | Mar. 01, 1870 | C.M. Stratton, E.A. Stratton | Improvement in Spirit Level | wooden levels |
| 191,389 | May 29, 1877 | T. Bedworth, F.T. Ward | Improvement in Spirit Levels | metallic levels |
| 250,080 | Nov. 29, 1881 | F. Kraengel | Spirit Level | inclinometers |
| 266,671 | Oct. 31, 1882 | W.L. Bergen | Plumb Bob | plumb bobs |
| 267,655 | Nov. 14, 1882 | W.C. Vajen | Plumb Bob | plumb bobs |
| 329,573 | Nov. 03, 1885 | A. Leidgen | Plumb Bob | plumb bobs |
| 370,826 | Oct. 04, 1887 | C.M. Stratton, E.A. Stratton | Spirit Level Stock | wooden levels |
| 423,484 | Mar. 18, 1890 | W. Martin | Inclinometer | inclinometers |
| 511,377 | Dec. 26, 1893 | J.A. Traut | Spirit-Level | metallic levels |
| 594,692 | Nov. 30, 1897 | G. Henneberg | Spirit Level | levels |
| 630,262 | Aug. 01, 1899 | A. Nacke | Plumb Bob | plumb bobs |
| 703,678 | Jul. 01, 1902 | J.A. Traut | Spirit-Level | levels |
| 730,568 | Jun. 09, 1903 | W. Potter | Combination Carpenter's Level | spirit levels |
| 1,308,765 | Jul. 08, 1919 | G.C. Powell | Level | levels |
| 4,463,501 | Aug. 07, 1984 | G.T. Macklin, R.J. Wright | Level Construction and Methods of Constructing a Level | levels |
