1974
The acoustic signals were recorded using a fiber Bragg grating sensor during the powder bed additive manufacturing process in a commercially available selective laser melting machine .
 material: fiber; machine or equipment: sensor; manufacturing process: powder bed additive manufacturing; manufacturing process: selective laser melting; machine or equipment: machine
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: fiber, sensor, powder bed additive manufacturing, selective laser melting, machine 
Answer:
 material: fiber; machine or equipment: sensor; manufacturing process: powder bed additive manufacturing; manufacturing process: selective laser melting; machine or equipment: machine