NP EN 10378
NP EN 10378 (Welded stainless steel square and rectangular tubes for mechanical and structural engineering and decorative use - Technical delivery conditions)· NP (葡萄牙) · 46 种材料
NP EN 10378 (Welded stainless steel square and rectangular tubes for mechanical and structural engineering and decorative use - Technical delivery conditions)· NP (葡萄牙) · 46 种材料