917
Although vibration-assisted powder delivery systems have been developed and studied in the literature , their characteristics and principles of operation are generally not well suited for powder-based additive manufacturing operations mainly because of their powder flows and deposition characteristics .
 machine or equipment: powder delivery systems; manufacturing process: powder-based additive manufacturing; material: powder; concept or principle: deposition
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: powder delivery systems, powder-based additive manufacturing, powder, deposition 
Answer:
 machine or equipment: powder delivery systems; manufacturing process: powder-based additive manufacturing; material: powder; concept or principle: deposition