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| Patents for Louis Lowenstein | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,295,180 | Feb. 25, 1919 | L. Lowenstein | Depth Angle-Gage | depth gauges | |
| 1,308,988 | Jul. 08, 1919 | L. Lowenstein | Ratchet Extension for Micrometers | measurement gauges | |