Hellow guys, Welcome to my website, and you are watching 기밀 정보 흔적없이 삭제…사라지는 전자소자 개발. and this vIdeo is uploaded by 사이언스프렌즈 at 2016-11-15T02:49:05-08:00. We are pramote this video only for entertainment and educational perpose only. So, I hop you like our website.