energy,solar energy,advertising for solar energy,Umwelttag Marienhof,Munich,1986,old,man,men,solar collectors,solar collector,information,info,technics,technologies,preventive environmental protection,for environmental reasons,renewable energies,regenerative,photovoltaic cell,solar cells,photovoltaic cells,multijunction solar cell,invention,inventions,generations,solar energy,environment engineering,environmental technology,electricity,generation of current,electricity generation,power generation,energies,solar energy,solar po,Additional-Rights-Clearences-Not Available

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