This is Woosung Development specialized in cancer crushing!! For construction and inquiries, please call +82 10 9838 9131 Please contact us at ~ You can refer to the Woosung development blog below, such as work videos and additional explanations. Equipment to break forward (noise core drill, vibration-free halting / Air rig rock drill) Many videos such as introduction and construction videos It's a plan to upload, so we ask for your interest~