1369
The first design uses an enclosed chamber to provide a good inert gas shielding environment , similar to laser Power-Bed Fusion systems .
 engineering feature: design; concept or principle: inert gas; enabling technology: laser; concept or principle: Fusion
Please list all entity words in the text that fit the category.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} 
Answer:
 engineering feature: design; concept or principle: inert gas; enabling technology: laser; concept or principle: Fusion