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| All Patents in class 177/25.13 | |||||
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| Number | Date | Patentee | Title | Type | |
| 3,044,691 | Jul. 17, 1962 | K.C. Allen | Computing scale | ||
| 3,665,169 | May 23, 1972 | L.E. Miller, R. Zechlin, R.M. Henderson | Electronic Measuring Unit | electrical measuring apparatus | |