In 1980, the institute and Beijing municipal electrical factory has successfully developed line frequency coreless bathroom plug stem bottom note type electric insulation casting.
年，北京市机电研究院与北京玛钢厂研制成功工频无芯塞杆底注式保温浇注电炉。
In 1980, the institute and Beijing municipal electrical factory has successfully developed line frequency coreless bathroom plug stem bottom note type electric insulation casting.
年，北京市机电研究院与北京玛钢厂研制成功工频无芯塞杆底注式保温浇注电炉。
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