活塞椭圆磨床
piston oval -grinding mahcine
piston ellipsoid grinding machine
中凸变椭圆活塞
Middle-convex and varying ellipse piston
Middle-bulged varying ellipse piston
组合圆形活塞声源
built-up circular piston sound source
半椭圆形弹簧
half-elliptic spring(semi-elliptic spring
semi elliptic spring
half elliptic spring
semi-elliptical spring
half-elliptic spring
半椭圆形垄
ridge of half ellipse shape
变形椭圆齿轮
Deformable elliptic gears transmission
变形椭圆模板
deformable ellipse template
波浪形椭圆焊管
Corrugated oval welded pipe