But the US and Japan held all the patents for light steel frameworks. The methods developed abroad didn't use welds to join the parts for fear of weakening the structures, and therefore required large, specially built machines for assembly. Hsieh recognized that it would have been incredibly expensive to import these patented materials and assembly equipment.
不過，輕型鋼的專利技術都掌握在日本、美國之手，國外開發的輕型鋼不用焊接手法連結接點，唯恐破壞強度，但卻必須使用一種大型特殊機具才能連結，若進口國外的專利材質與設備，成本太高。