Single-stage cyclinder gear reducer(Utility Model Patent Certificate)

Separate-box Independently Lubricated Locomotive reducer(Utility Model Patent Certificate)

Planetary differential reducer with double input and double output(Utility Model Patent Certificate)

Manuallly operated clutch device for gear reducer(Utility Model Patent Certificate)

Friction clutch device for worm gear reducer(Utility Model Patent Certificate)

Coaxial planetary differential mixing-speed reducer(Utility Model Patent Certificate)

Bevel-worm gear reducer with overload protection(Utility Model Patent Certificate)

License for small-sized screw headstock gear

License for small-sized mobile headstock gear