Pertains to internal blinds, whatever their design and the nature of the materials used, as listed below: - venetian blind: free hanging, guided, non-retractable; - roller blind: free hanging, side guided, with tensioned fabric; - vertical blind: free hanging, with top and bottom track, sloping headrail; - pleated and honeycomb blind: free hanging, guided, laterally moving, tensioned; - Roman Shades; - Austrian/Festoon blinds; - panel blinds; - plantation shutters; and - roll-up blinds.