1)low-frequency induction furnace,低频[率]感应[电]炉2)low frequency induction furnace,低频感应电炉3)low frequency induction,低频感应炉4)low-frequency induction furnace,低频高压电炉，低频感应电炉5)high frequency induction furance,高加波感应电炉，高频率感应电炉6)low frequency induction melting furnace,低频感应熔化炉