| All Patents in class 33/381 |
Patents 16 -
30
of 36
      |
| Number | Date | Patentee | Title | Type |
| 781,749 | Feb. 07, 1905 | F.T. Stevens | Instrument for Squaring Stone | stone squaring tools |
| 785,581 | Mar. 21, 1905 | A.V. Shorts | Level | level adjustments |
| 786,269 | Apr. 04, 1905 | L.M. Curry | Spirit Level | levels |
| 825,217 | Jul. 03, 1906 | S.E. Hodge, E.N. Hull | Combination square, level, bevel, and compass | bevels |
| 876,720 | Jan. 14, 1908 | E.A. King | Level | wooden levels |
| 980,362 | Jan. 03, 1911 | L.S. Starrett | Combined Square and Bevel Protractor | protractors |
| 1,087,555 | Feb. 17, 1914 | J. Sand, J. Sand, Jr. | Level | spirit levels |
| 1,130,552 | Mar. 02, 1915 | E.A. Trenholm | Spirit Level | |
| 1,213,020 | Jan. 16, 1917 | W.A. Roeske | Level | level adjustments |
| 1,281,096 | Oct. 08, 1918 | C.F. Thullen | Level device | levels |
| 1,286,767 | Dec. 03, 1918 | G.C. Powell | Peerless Level | wooden levels |
| 1,303,829 | May 13, 1919 | G.A. Vogel | Stock for Spirit Levels | metallic levels |
| 1,393,328 | Oct. 11, 1921 | C.F. Thullen | Level device | levels |
| 1,426,454 | Aug. 22, 1922 | G. Bredeson | Peerless Level | wooden levels |
| 1,587,258 | Jun. 01, 1926 | P.H. Vogel | Stock for Spirit Levels | metallic levels |
