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A pressure-controlled , piston-driven extruder is then described which allows for rapid responses and precise control over the material flow rate .
 concept or principle: pressure-controlled; machine or equipment: piston-driven extruder; concept or principle: precise control; process parameter: material flow rate
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: manufacturing standard, machanical property, manufacturing process, material, engineering feature, process parameter, machine or equipment, application, process characterization, enabling technology, biomedical, concept or principle 
Text: {0} 
 Entities: pressure-controlled, piston-driven extruder, precise control, material flow rate 
Answer:
 concept or principle: pressure-controlled; machine or equipment: piston-driven extruder; concept or principle: precise control; process parameter: material flow rate