经过加工，一对夫妇的通行证上一块石头或一块细砂纸在平面上删除加工商标，并允许部分顺利过渡到由单位双方的半径。
After machining , a couple of passes on a stone or piece of fine sandpaper on a flat surface remove the machining marks and allow the part to transition smoothly from flat sides into the radius .
平面商标