Number | Name | Date | Kind |
---|---|---|---|
1781281 | Hogrebe | Nov 1930 | |
2936907 | Woodruff | May 1960 | |
3059782 | Baudhuin | Oct 1962 | |
3760591 | Gordon | Sep 1973 | |
3888356 | Redelfs | Jun 1975 | |
4378072 | Appleman et al. | Mar 1983 | |
4433952 | Glickman | Feb 1984 |
Entry |
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Tower Whirler, Engineering News Record, 10/4/1917, Dravo-Doyle Company, Pittsburgh. |