| All Patents in class 33/385 |
Patents 16 -
28
of 28
      |
| Number | Date | Patentee | Title | Type |
| 778,131 | Dec. 20, 1904 | D.A. James | Spirit Level | |
| 804,792 | Nov. 14, 1905 | A.C. Brundage | Adjustable Spirit Level | levels |
| 895,573 | Aug. 11, 1908 | W.L. Myers | Spirit level | |
| 1,177,131 | Mar. 28, 1916 | W.J. Neidl | Level | levels |
| 1,211,882 | Jan. 09, 1917 | E.A. Schade | Spirit-Level | metallic levels |
| 1,241,399 | Sep. 25, 1917 | E.A. King | Level | wooden levels |
| 1,281,096 | Oct. 08, 1918 | C.F. Thullen | Level device | levels |
| 1,393,328 | Oct. 11, 1921 | C.F. Thullen | Level device | levels |
| 1,683,256 | Sep. 04, 1928 | W.L. Myers | Carpenter's Level | |
| 1,931,730 | Oct. 24, 1933 | W.S. Klay | Means for Setting Planer Heads | metal planer accessories |
| 2,211,201 | Aug. 13, 1940 | W.B. Fell | Machinist's precision level | spirit levels |
| 2,316,777 | Apr. 20, 1943 | W.B. Fell | Machinist's precision level | spirit levels |
| 3,030,710 | Apr. 24, 1962 | W.B. Fell | Micro-precision levels | spirit levels |
