| All Patents in class 33/376 |
Patents 1 -
13
of 13
      |
| Number | Date | Patentee | Title | Type |
| 9,867 | Jul. 19, 1853 | S.J. Sherman | Pocket Level | levels |
| RE374 | Jul. 01, 1856 | S.J. Sherman | Pocket Level | levels |
| 26,956 | Jan. 24, 1860 | J. Steger | Pocket-Level | levels |
| 69,602 | Oct. 08, 1867 | H. Baker, J.T. Zimmerman | Improvement in Plumb-Levels | pendulum levels |
| 407,285 | Jul. 16, 1889 | C. Ensminger | Combined Square, Level, Protractor, &c. | combination tools |
| 414,372 | Nov. 05, 1889 | J. Brakeley | Spirit Level | levels |
| 517,935 | Apr. 10, 1894 | A. Schnell | Spirit Level Attachment | levels |
| 565,098 | Aug. 04, 1896 | J.A. Traut | Level | levels |
| 819,965 | May 08, 1906 | H.S. Williams | Leveling Instrument | levels |
| 871,996 | Nov. 26, 1907 | J. Haugland, J. Jacobson | Folding Level | wooden levels |
| 886,333 | Apr. 28, 1908 | D.H. Southward | Attachment for Levels | inclinometers |
| 903,011 | Nov. 03, 1908 | F. Schtabe | Level | |
| 1,066,013 | Jul. 01, 1913 | F. Henning | Level | levels |
