| All Patents in class 33/374 |
Patents 1 -
11
of 11
      |
| Number | Date | Patentee | Title | Type |
| 283,564 | Aug. 21, 1883 | B.B. Butt | Right Angled Level | machinist levels |
| 342,303 | May 18, 1886 | J. Morrison | Combined Plumb, Level and Rule | plumbs |
| 445,646 | Feb. 03, 1891 | A.A. Welsh | Carpenter's Gage | marking gauges |
| 479,803 | Aug. 02, 1892 | J.M. Haise | Grade Measure | clinometers |
| 714,957 | Dec. 02, 1902 | O.F. Sinigar | Plumb Level | plumbs |
| 740,742 | Oct. 06, 1903 | J.F. Bush | Rule | wooden levels |
| 1,403,606 | Jan. 17, 1922 | C.L. Klapproth | Level | levels |
| 1,406,262 | Feb. 14, 1922 | M.R. Kronert | Tool for Laying Out Keyways | special purpose gauges |
| 1,413,056 | Apr. 18, 1922 | C.L. Cooley, G.L. Parrish | Adjustable Plumb and Level | levels |
| 1,430,904 | Oct. 03, 1922 | H.J. Hunter | Extension Stock for Level | inclinometers |
| 1,511,464 | Oct. 14, 1924 | A.M. Guillet | Adjustable Level for Spinning Frames | levels |
