our company, suzhou nanhang tenglong science & technology co., ltd, is a joint-venture by nanjing university of aeronautics & astronautics and tenglong machinery co., ltd. our company is an experienced manufacturer and exporter with advanced technology of vacuum brazed diamond. meanwhile, we produce many kinds of stone processing machines and equipment for making diamond tools. with iso9000 quality control system, the products of our company are of excellent quality with high efficiency and long working life. among vacuum brazed diamond tools, diamond bead, diamond core bit and diamond saw blade are patent products in china. among the machines, sym-7b has passed the ce certificate. all the other export machines have reached ce standard.