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| Patents for Dura Co. | |||||
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| Number | Date | Patentee | Title | Type | |
| D89,211 | Feb. 07, 1933 | K. Rettich | Design for a Cork | corkscrew accessories | |
| D89,308 | Feb. 21, 1933 | K. Rettich | Design For A Combined Corkscrew And Guard | figural cork extractors | |