“福岛株式会社: Explosion-proof switch; 山本电机工业: BH 212-3; 插座 ,plug and switches pdf.Sheet 7.” “AC 250V 16A Ex ed Ⅱ C T 6 防护等级:知识产权 56 材料:Casting brass ” NANJING FRIENDS ELECTRICAL.BH 212-3.NA