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| Patents for Derek Foster | |||||
| Picture | Number | Date | Patentee | Title | |
![]() | 4,476,801 | Oct. 16, 1984 | D. Foster, C. Rich | Mooring device | |
![]() | 4,722,293 | Feb. 02, 1988 | D. Foster, R. Ballantyne | Integrated winch and windlass | |