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| All Patents of Type: scales | |||||
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| Number | Date | Patentee | Title | Type | |
| 2,907 | Jan. 10, 1843 | J.P. Smith | Merchant's Slide Rule | scales | |
| NS-13 | Jul. 12, 1851 | A. Chisholm | Mathematical mechanical scale to solve problems in trigonometry | scales | |
| 1,404,450 | Jan. 24, 1922 | G.A. Lofland | Direct Reading Proportional Scale | scales | |
| 1,816,548 | Jul. 28, 1931 | L. Robidoux | Simplified Rule (Fractional markings to 64's) | scales | |