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| All Patents in class 177/229 | |||||
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| Number | Date | Patentee | Title | Type | |
| 2,033,318 | Mar. 10, 1936 | H. Abramson | Indicator gear for measuring instruments and the like | special measuring tools | |
| 2,873,416 | Feb. 10, 1959 | K.C. Allen | Weighing scale adapted servomotor system | ||
| 3,877,532 | Apr. 15, 1975 | J.D. Hale | Low Profile Scale | scales and balances | |