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| All Patents in class 33/381 | |||||
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| Picture | Number | Date | Patentee | Title | |
 | 20,943 | Jul. 20, 1858 | W.O. Fritschler | Carpenter's Rule | |
 | 28,104 | May 01, 1860 | W.T. Nicholson | Spirit Level | |
 | 320,537 | Jun. 23, 1885 | B.B. Butt | Spirit Level | |
 | 354,076 | Dec. 07, 1886 | E.E. Webb | Spirit Level | |
 | 423,484 | Mar. 18, 1890 | W. Martin | Inclinometer | |
 | 423,669 | Mar. 18, 1890 | J.A. Byrne | Spirit Level | |
 | 436,495 | Sep. 16, 1890 | P.L. Fox | Spirit Level | |
 | 453,452 | Jun. 02, 1891 | J.A. Traut | Hand-y Groove | |
 | 469,451 | Feb. 23, 1892 | W. Praddex | Spirit Level | |
 | 498,726 | May 30, 1893 | C.W. Preston | Stock for Surface Gages or Other Implements | |