Number | Name | Date | Kind |
---|---|---|---|
D184988 | De Hart et al. | Apr 1959 | |
3517184 | Norton et al. | Jun 1970 | |
3833800 | Stewart et al. | Sep 1974 | |
4856452 | Pingel et al. | Aug 1989 |
Entry |
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Pages 16 and 17 of Attwood Catalog, 1983/1984. |
Pages 36 and 37 of Attwood Catalog 1987/1988. |