Number | Name | Date | Kind |
---|---|---|---|
D321854 | Foley et al. | Nov 1991 | |
637547 | Clark | Nov 1899 | |
1761883 | Froedtert | Jun 1930 | |
2177074 | Mattson | Oct 1939 | |
3352276 | Zimmerman | Nov 1939 | |
3593684 | Cogliano | Jul 1971 | |
4021873 | Francois | May 1977 | |
4323352 | Warren et al. | Apr 1982 | |
4493657 | Zeitler | Jan 1985 | |
4836298 | Laboureau | Jun 1989 | |
4968274 | Gregory | Nov 1990 |
Entry |
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Scientific American, "Human-Powered Watercraft" brochure Dec. 1986. |