Number | Name | Date | Kind |
---|---|---|---|
895761 | Huntoon | Aug 1908 | |
2580555 | Kroeger | Jan 1952 | |
3072920 | Yellott | Jan 1963 | |
3411163 | Myers, Jr. | Nov 1968 | |
3466119 | Francia | Sep 1969 | |
3620206 | Harris, Jr. et al. | Nov 1971 | |
3893443 | Smith | Jul 1975 |
Number | Date | Country |
---|---|---|
13,780 | Jun 1928 | AU |
Entry |
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Solar Heating for Swimming Pools, An Interim Report by S. R. Robson, B.E., New Zealand Engineering, pp. 298-299, Sept. 1956. |