| All Patents in class 33/809 |
Patents 31 -
44
of 44
      |
| Number | Date | Patentee | Title | Type |
| 1,050,733 | Jan. 14, 1913 | F.C. Greathead | Telescoping Pocket Rule | extensible rules |
| 1,068,887 | Jul. 29, 1913 | H. Gasstrom | Rule | extensible rules |
| 1,081,995 | Dec. 23, 1913 | L. Voggenreiter | Rule | folding rules |
| 1,088,175 | Feb. 24, 1914 | W.O. Phillips | Slide Rule | slide rules |
| 1,159,012 | Nov. 02, 1915 | H. Gasstrom | Structure Made of Relatively Movable Interlocking Sections | folding rule joints |
| 1,288,556 | Dec. 24, 1918 | H. Gasstrom | Interlox Rule | folding rule joints |
| 1,299,627 | Apr. 08, 1919 | H. Simon | Rule | folding rules |
| 1,338,176 | Apr. 27, 1920 | G.L. Finstrom | Extensible Rule | extensible rules |
| 1,391,621 | Sep. 20, 1921 | F.H. Fenwirth | Extension Rule | |
| 1,432,834 | Oct. 24, 1922 | F. Buck | Folding Rule | rules |
| 1,488,482 | Apr. 01, 1924 | J.Y. Eckman | Extensible Rule | extensible rules |
| 1,558,879 | Oct. 27, 1925 | F.H. Hoare | Linear Measure Scale | measuring apparatus |
| 1,583,585 | May 04, 1926 | E.A. Emory | Measuring and Centering Device | bore gages |
| 1,636,637 | Jul. 19, 1927 | T.S. Hutchinson | 12-in-1 Tool | rules |
