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Solar energy collectors for electricity generation; solar collectors for electricity generation; ultraviolet filters, other than for medical use; infrared filters; photovoltaic apparatus and installations for generating solar electricity.Windows, not of metal, for buildings, building structures, balustrades, awnings and facades; glass for the windows of buildings; glass for windows; glass in sheet form for use in windows; glass panels for windows; non-metallic window frames; multi-layered insulating glass units for glazing buildings; vacuum insulated multi- layered insulating glass units for glazing buildings; non-metallic balustrades; non-metallic awnings for buildings made of glass; facades of non-metallic materials; non-metallic window facades; curtain walling of non-metallic materials; curtain walling installations of non-metallic materials; non-metallic frames and structures for buildings; roofing, not of metal, incorporating photovoltaic cells; infrared reflective glass for use in buildings; sealed integrated glass units for building; thermal insulating glass for use in building; glass units, incorporating photovoltaic elements, for glazing buildings; glass units, incorporating electricity-generating diffractive or refractive elements, for glazing buildings; glass units, incorporating spectrally selective elements for electricity generation, for glazing buildings; glass units, incorporating apparatus for the diffraction of infrared and ultraviolet light for electricity generation, for glazing buildings; multilayered insulating glass units, incorporating vacuum insulation and photovoltaic elements, for glazing buildings.