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| All Patents in class 235/61R | |||||
| Number | Date | Patentee | Title | Type | |
| 8,236X | Jun. 06, 1834 | D. Kohler | Adding machine | ||
| 184,177 | Nov. 07, 1876 | J.C. Rorick | Bevel-Square | bevel squares | |
| 697,335 | Apr. 08, 1902 | I.B. Hagan | Measuring Instrument | protractors | |
| 2,055,965 | Sep. 29, 1936 | J.W. Bryce | Scale | ||