... gearbox, plastic gearbox, plastic extruder gearbox, plastic extrusion machine gearbox, hard tooth gearbox, gearbox for plastic extruder, ... gearbox for plastic extrusion machine, plastic extruder machine, plastic extrusion machinery, plastic extruder, plastic wire ... according to the specification in code ZBJ19009-88, featured with high-strength alloy steels for gear wheel ...