Later, Prof. Lin started to design, manufacture and export button-making machines to assist under-developed countries start up their own industries in the line. Despite his success, Prof. Lin is still not satisfied.
而四廠中性質與眾不同，最突出的要數第四廠：它專門設計並製造生產鈕釦的機器，輸山鈕釦工廠的整廠設備，協助開發中的國家建立鈕釦工業。