We hope your business is well with you.GNR Co., Ltd, is the only specialized company that manufactures Non-vibrational Rock Splitter, GNRⓇ, and provides the special civil engineering service in the most korean construction markets such as tunnels of subway, express railroad and highway, ground excavation for building, underground work, rocky sites, quarrying and mining etc.Our system is patented in worldwide countries and it is acknowledged as Neo-technology by the Korean Ministry of Construction & Transportation We are available to demonstrate our system in your workplace and to invite your engineers to show ours. You can find our more on our homepage at www.gnr.co.krWe look forward to hearing from you soon.