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| All Patents in class 33/497 | |||||
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| Number | Date | Patentee | Title | Type | |
| 549,745 | Nov. 12, 1895 | R.S. Whittier, D.R. Porter | Two-Foot Rule | folding rule joints | |
| 732,827 | Jul. 07, 1903 | S. Chambers | Combination Tool | bevel squares | |
| 981,786 | Jan. 17, 1911 | H.T. Montgomery | Tool | ||
| 1,690,832 | Nov. 06, 1928 | I.J. Owen | Combination Paper-Cutting Tool, Rule, and Drafting and Measuring Instrument | folding rules | |