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| All Patents in class 33/788 | |||||
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| Number | Date | Patentee | Title | Type | |
| 2,099,896 | Nov. 23, 1937 | A.B. Kinzel | Indicating Extensometer | measurement gauges | |
| 2,546,155 | Mar. 27, 1951 | E.K. Coats, B.D. Haber | Deflection Indicator | measurement gauges | |