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Roto Frank DST Vertriebs-GmbH: In the family-owned German company approx. 1,200 people work passionately on intelligent solutions for modern, comfortable living under rooftops – and have made Roto one of the world's leading manufacturers of roof windows. Roto products feature outstanding energy efficiency, exemplary operating comfort and installation ease. Be it roof windows or accessories. Uncomp... see moreromising quality from professionals for professionals: This is Roto. ... see less