Nanjing Dilong No-Dig Engineering Co., Ltd., a member of International Society for Trenchless Technology (ISTT) and China Society for Trenchless Technology (CSTT), started the application research of trenchless / No-dig technology in 1996 and was registered in 1998. Nanjing Dilong No-dig Engineering Co., Ltd. is the earliest specialized private company in no-dig technology development and construction in China. After long-term experiment and improvement, our machine is qualified to go into the overseas market. Since 2002, we have been selling our machines throughout the whole world. According to the development of the market and clients' demand, our designation and research team goes further and further. Till now, we have three series of HDD machines: DL series machines, DF series machines which include the most advanced mini HDD machines DFM1504, and DDL series products. In order to provide timely and efficient service for customers, our company sets up two new branches in Guangzhou and Tianjin in 2009. At present, the branch has worked well, covering the main country. We are adhering to the enterprise spirit--being sincere, concentrate and pragmatic; making a bright future with customers.