절대 멈추지 않는 고무줄 선풍기
#선풍기#고무줄#전기절약#DIY#실험 1 The reference is marked in the video 2 If you have any problems with video copyright, please contact me immediately 3 The Copyright Act's fair use provision permits non-infringing use of copyrighted material for purposes like criticism, commentary, news, teaching, scholarship, and research, especially when non-profit or educational haniwind1229@gmail com
