sentences:  Despite initial problems, in the years following the war, Hans managed to expand the zip fastener business with the newly developed plastic zip, ”Prymalon”, as an addition to the traditional products.In 1960, after prolonged negotiations, he was successful in buying back all Austrian properties and rights, which was of essential importance, particularly regarding the ”Prym” brand name.His marriage to Russian-born Olga Gütschow (1884–1975) in 1903 produced six sons, four of whom worked in the company.