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An in situ powder mixing system was designed to mix both metal and glass powders at selective ratios and the mixed powders were dispensed with an ultrasonic vibration powder feeding system with multiple nozzles .
 concept or principle: in situ; concept or principle: mixing; engineering feature: designed; material: metal; material: glass; material: powders; machine or equipment: ultrasonic vibration powder feeding system; machine or equipment: nozzles
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: in situ, mixing, designed, metal, glass, powders, ultrasonic vibration powder feeding system, nozzles 
Answer:
 concept or principle: in situ; concept or principle: mixing; engineering feature: designed; material: metal; material: glass; material: powders; machine or equipment: ultrasonic vibration powder feeding system; machine or equipment: nozzles