| All Patents in class 33/374 |
Patents 1 -
10
of 12
      |
| Picture | Number | Date | Patentee | Title |
 | 283,564 | Aug. 21, 1883 | B.B. Butt | Right Angled Level |
| | 342,303 | May 18, 1886 | J. Morrison | Combined Plumb, Level and Rule |
 | 445,646 | Feb. 03, 1891 | A.A. Welsh | Carpenter's Gage |
 | 466,871 | Jan. 12, 1892 | A. Sevanson, H. Krogsted | Try-Square Level Combination |
| | 479,803 | Aug. 02, 1892 | J.M. Haise | Grade Measure |
| | 714,957 | Dec. 02, 1902 | O.F. Sinigar | Plumb Level |
 | 740,742 | Oct. 06, 1903 | J.F. Bush | Rule |
 | 1,403,606 | Jan. 17, 1922 | C.L. Klapproth | Level |
 | 1,406,262 | Feb. 14, 1922 | M.R. Kronert | Tool for Laying Out Keyways |
 | 1,413,056 | Apr. 18, 1922 | C.L. Cooley, G.L. Parrish | Adjustable Plumb and Level |
