In this 1941 [[:File:Aurora-Invoice-1941-10.jpg|invoice]], is mentioned a model called [[Olo Flexor]], produced at least in large and medium sizes. It is not clear to which model it refers. | In this 1941 [[:File:Aurora-Invoice-1941-10.jpg|invoice]], is mentioned a model called [[Olo Flexor]], produced at least in large and medium sizes. It is not clear to which model it refers. |