differential screw jack
differential-screw jack
three-level straight line differential mechanism
Compound screw mechanism
double-helical screw mechanism
circle setting mechanism mechanism
alternating differential of differential form
Bus Differential Complex Percentage Differential Protection
Positioning Screw， Set Screw
right hand screw [= right handed screw]
screw hexagon socket head cap screw
hoisting mechanism and walking mechanism
three-dimensional mechanism (spacial mechanism)