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| All Patents in class 177/231 | |||||
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| Number | Date | Patentee | Title | Type | |
| 197,618 | Nov. 27, 1877 | M.S. Drake | Improvement in spring-scales for weighing | scales and balances | |
| 3,095,054 | Jun. 25, 1963 | K.C. Allen | Weighing scales | ||