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据五金手册记载,五金制品亦称金属制品,主要是指使用有色金属和黑色金属制造日常生活与生产用的(不包括机械制造)五金制品。武汉的金属制品起源早,种类多,是手工业的传统行业和骨干行业之一。20世纪20年代以后,据五金手册介绍,武汉的金属制品业又有新的发展,除传统的铜、铁器外,增加了白铁、钢精、钮扣、电镀、铜铁
Solenoid valve is a kind of automatic instrument actuator that we are familiar with. As an important industrial product directly related to enterprise safety production, it has an indispensable and pivotal position in many fields. Due to its simple structure, safe use, reliable work, small power, an