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| All Patents in class 33/458 | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,501,713 | Jul. 15, 1924 | J.H. McCaffrey | Rustless Rule | folding rule joints | |
| 1,515,055 | Nov. 11, 1924 | R. Katolin | Folding Rule | ||
| 1,978,887 | Oct. 30, 1934 | A.L. Stowell | Folding extension rule | folding rules | |
| 1,979,567 | Nov. 06, 1934 | C.M. Nicholson | Folding Rule | folding rule joints | |
| 2,698,484 | Jan. 04, 1955 | C.R. Zern, F. Schwarzer | Rule Trammel | rule accessories | |