19 Glass for building and construction; construction and building materials, namely, glass panels and panes having diffractive or refractive elements for use in energy harvesting; construction and building materials, namely, glass panels and panes incorporating optical coatings for use in energy harvesting; non-metal windows; glass façade panels for building; non-metal greenhouse panels; non-metal windows, glass façade panels for building purposes and non-metal greenhouse panels incorporating optical coatings for use in energy harvesting; optical coating sold as an integral part of building glass