Number | Name | Date | Kind |
---|---|---|---|
507999 | Davis | Nov 1893 | |
1254520 | Macduff | Jan 1918 | |
3488505 | Jentoft et al. | Jan 1970 | |
3511559 | Foster | May 1970 | |
3902056 | Aizenberg et al. | Aug 1975 | |
4023034 | Schacht | May 1977 | |
4122334 | Owens | Oct 1978 |
Number | Date | Country |
---|---|---|
1501297 | Feb 1978 | GBX |
Entry |
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M. A. Duguay et al., "Lighting with Sunlight Using Sun Tracking Concentrators"; Applied Optics, vol. 16, #5, May 1977; pp. 1444-1446. |