Flat-top Tower Crane , Linden Comansa Technology , 21CJ210-12t Jib Length ... ton* Original technology Creater and Leader of Flat-Top Tower Crane in the world* Modular system invented Linden Comansa Group ... * World-wide exchangeable with Linden Comansa Flat-top Tower Crane* Intelligent inverter , not only knows the speed ... efficiency, reliable, Lower energy cost Flat top Tower Crane model 21CJ210-12t