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Trough Design 4129119,1978
Trough Design 4108154,1978
Trough Design 4135493,1979
Trough Design 4178913,1979
Trough Design 4240406,1980
Trough Design 4297003,1981
Trough Design 4296737,1981
Trough Design 4423719,1984
Trough Design 4493313,1985
Trough Design 4611575,1986
Trough Design 5058565,1991
Trough Design 6406155,2002
Trough Design 5964216,1999 (Expires 2019)
Fresnel Design 4131336,1978
Fresnel Design 4149817,1979
Method of manufacturing 4236399,1980
Method of manufacturing 4268332,1981
Method of manufacturing 4243019,1981
Method of manufacturing 4372027,1983
Method of manufacturing 6035850,2000
Method of manufacturing 11/157,607,2005
Solar Cooling 4246885,1981
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