User:Shinyoonkyoung

Geojunggi (举重机) · nokro (辘轳) with fertility (茶山) Jeong Yak-yong (丁若镛) Hwaseong Fortress 2 (华城) devised an invention that is new to chukjohal. Existing large wagon wheels put too big and difficult tubakhae stones, breaking the wheel is easy to buy the weak, to create disadvantage was costly. The body touch the ground, pushing the sled to turn off the power to compensate for the shortcomings of the two made.