Hellow guys, Welcome to my website, and you are watching 사물인터넷(IoT)기반 건설현장 통합안전관리시스템 '지에스아이엘'. and this vIdeo is uploaded by 전화성의 CNTV at 2020-11-23T18:00:00-08:00. We are pramote this video only for entertainment and educational perpose only. So, I hop you like our website.
