pinion drive assembly spring
Spring Force of Constant Torque Spring and Wing-up Spring
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
compact disc recordable drive [CD recordable drive]
compact disc rewritable drive [CD rewritable drive]
DE-ME-Drive (decoding memory drive)
diesel-electric drive [= diesel electric drive
Diskette Drive， Floppy Disk Drive FDC