mechanical transmission detent spring
reverse box detent spring
Spring Force of Constant Torque Spring and Wing-up Spring
AC transmission line parallelly erected with DC transmission lines
contact spring pile-up (contact spring assembly)
half-elliptic spring(semi-elliptic spring)
hard spring， hardening spring
plate spring (plate-form-spring)
plate-form spring (plate spring)
Shape and Spring Back of Constant Torque Spring
soft spring ，softening spring
soft spring， softening spring
spring wheat spring corn intercropping system
(pressure)gauge with transmission device
±500 kV ultrahigh voltage DC transmission line
±800 kV DC transmission system