| Bs_en_288.1-1992__%e9%87%91%e5%b1%9e%e6%9d%90%e6%96%99%e7%84%8a%e6%8e%a5%e5%b7%a5%e8%89%ba%e8%a7%84%e8%8c%83%e5%92%8c%e8%ae%a4%e5%8f%af__%e7%ac%ac1%e9%83%a8%e5%88%86%ef%bc%9a%e7%86%94%e7%84%8a%e7%9a%84%e4%b8%80%e8%88%ac%e8%a7%84%e5%88%99.pdf - Search specification approval welding procedures metallic |