| Number | Name | Date | Kind |
|---|---|---|---|
| D184288 | Mart | Jan 1959 | |
| 3243166 | Osenga et al. | Mar 1966 | |
| 3743257 | Fordyce | Jul 1973 | |
| 3807145 | Engalitcheff | Apr 1974 | |
| 3903217 | Heneby et al. | Sep 1975 | |
| 4020130 | Ovard | Apr 1977 |
| Entry |
|---|
| Industrial Equipment News, Apr. 1969, p. 139, "Cooling Tower" item. |