| All Patents in class 33/379 |
Patents 1 -
15
of 21
      |
| Number | Date | Patentee | Title | Type |
| 100,463 | Mar. 01, 1870 | C.M. Stratton, E.A. Stratton | Improvement in Spirit Level | wooden levels |
| 129,183 | Jul. 16, 1872 | E.A. Stratton, C.M. Stratton | Improvement in adjustable spirit-levels | levels |
| 198,909 | Jan. 01, 1878 | T. Bedworth, F.T. Ward | Improvement in Spirit Levels | levels |
| 310,154 | Dec. 30, 1884 | B.F. Tyler | Spirit Level | levels |
| 339,369 | Apr. 06, 1886 | G. Blythe | Spirit Level | levels |
| 356,645 | Jan. 25, 1887 | H.N. Jasper | Akron Spirit Level | levels |
| 365,033 | Jun. 14, 1887 | O.D. Wood | Spirit Level | wooden levels |
| 383,196 | May 22, 1888 | C.M. Stratton, E.A. Stratton | Spirit Level | levels |
| 397,043 | Jan. 29, 1889 | R.D. Werden | Spirit Level | levels |
| 511,377 | Dec. 26, 1893 | J.A. Traut | Spirit-Level | metallic levels |
| 523,022 | Jul. 17, 1894 | J.A. Traut | Level | levels |
| 534,303 | Feb. 19, 1895 | J.A. Traut | Spirit-Level | levels |
| 562,679 | Jun. 23, 1896 | C. Bodmer, J.A. Traut | Method of Marking Level Glasses or Analogous Articles | levels |
| 649,626 | May 15, 1900 | H. Braun | Adjustable Level and Gage Attachment for Squares | |
| 674,107 | May 14, 1901 | J.A. Traut | Level-Glass | levels |
