| All Patents in class 33/343 |
Patents 1 -
15
of 25
      |
| Number | Date | Patentee | Title | Type |
| 60,690 | Jan. 01, 1867 | G.L. Chamberlain | Improvement in Combined Square and Level | levels |
| 101,477 | Apr. 05, 1870 | J.A. Littlefield | Improvement in Combined Square, Protractor, Level, & c. | squares |
| 114,378 | May 02, 1871 | M.M. Wilson | Improvement in Combined Square, Bevel, Plumb and Gauge | squares |
| 201,371 | Mar. 19, 1878 | W.P. Walter | Improvement in Combined Bevel, Square, and Level | try squares |
| 303,666 | Aug. 19, 1884 | F.W. Ritchie | Combination tool | |
| 304,601 | Sep. 02, 1884 | F.W. Boettcher | Combined Square, Level and Triangle | bevel squares |
| 312,743 | Feb. 24, 1885 | B.B. Merrill | Combined Square, Bevel and Level | squares |
| 329,156 | Oct. 27, 1885 | W. Ford | Combination Square and Gage | bevel squares |
| 339,158 | Apr. 06, 1886 | J.A. Finley | Combined square, level, and bevel | bevel squares |
| 419,615 | Jan. 14, 1890 | C. Stilwell | Adjustable Bevel Square | bevel squares |
| 426,001 | Apr. 22, 1890 | H.W. Evans | Combined Square, Level & Surface Gage | squares |
| 505,445 | Sep. 26, 1893 | W.R. Dorton | Adjustable Spirit Level and Plumb Device | spirit levels |
| 569,963 | Oct. 20, 1896 | O. Engman | Combined square, level, and T-square | combination tools |
| 651,037 | Jun. 05, 1900 | C.R. Hawkins | Combination Tool of Precision | squares |
| 706,095 | Aug. 05, 1902 | E. Oehrle | Combination Square and Protractor | squares |
