Scandinavian retro sofa bed and chairs help with manufacturer please

Hi, I've purchased this amazing Scandinavian (I think) sofa bed with chairs which I will get upholstered. The wood I'm certain is rosewood. I would love to know who the manufacturer/designer was as it has such an unusual mechanism and can't find anything similar. Shown in the last photo is the back of the sofa and at each side a leg pulls out to support the back when lowered to a bed. It's really smart. If anyone can help identify the designer I would very much appreciate it, been researching it for ages. Many thanks.