Patent
2023
2023
213215
2022
2022
Dongkyoung Lee, Seungik Son, ”The writing instrument capable of distance measurement; 거리 측정이 가능한 필기구”,10-2402695, Korea, 2022.05.23
213215
Dongkyoung Lee, Seungik Son, ”The writing instrument capable of distance measurement; 거리 측정이 가능한 필기구”,10-2402695, Korea, 2022.05.23