| All Patents in class 33/402 |
Patents 1 -
12
of 12
      |
| Number | Date | Patentee | Title | Type |
| 956 | Oct. 03, 1838 | L. Lewis | Balance and Pendulum Level and Plumb | pendulum levels |
| 36,312 | Aug. 26, 1862 | E. Thayer | Plane Angulometer | inclinometers |
| 361,728 | Apr. 26, 1887 | F. Sonntag | Plumb Level | wooden levels |
| 370,013 | Sep. 13, 1887 | O.B. Fuller | Pendulum Level | pendulum levels |
| 399,859 | Mar. 19, 1889 | A.B. Ewing | Plumb Level | inclinometers |
| 423,090 | Mar. 11, 1890 | F.F. Smith | Combined Square, Plumb, and Level | squares |
| 878,507 | Feb. 11, 1908 | J.M. Coghlan | Opticians Measuring Instrument | optician |
| 1,186,552 | Jun. 13, 1916 | D. Cohen, F.W. Weesner | Shoulder Measuring Device | special purpose gauges |
| 1,219,430 | Mar. 20, 1917 | A.W. Bjornstad | Instrument for Use in Topography | calipers |
| 1,404,393 | Jan. 24, 1922 | T. Henri | Combined Level and Grade Finder | inclinometers |
| 1,409,833 | Mar. 14, 1922 | H.A. Cook | Railroad Inclinometer | inclinometers |
| 3,286,357 | Nov. 22, 1966 | E.V. Grumman | Electronic Level | |
