봄날의 노란 신호등
"다음 신호가 기대되는 날입니다." -by 세.음. https://www.thehenryford.org/collections-and-research/digital-collections/artifact/227457/?fbclid=IwAR27SgW682HWYynSHSmm2xfcPWH_v4v3xsZm_8yNn4tY5Bn7Os0nu6Q8AQs#slide=gs-212816 First Tri-Color, Four-Directional Traffic Signal, 1920 - The Henry Ford Detroit traffic officer William Potts created this three-color, four-way traffic signal in 1920. Previous illuminated sig..
받아쓰기/세음
2022. 3. 5. 12:43