铁闸 Gates ; metal gate

铸铁闸阀 cast iron gate valve ; Iron Body Gate Valve

外掩铁闸 outward swinging metal gate

电动机闸磁铁 motor brake magnet

铁闸门 Portcullis

合闸电磁铁 closing electromagnet ; [电] making electromagnet

制动器送闸磁铁 brake release magnet

合闸磁铁 closing magnet ; switching magnet

铁皮铁闸弹子门锁 double cylinder mortise dead lock