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In this work , Al–Cu ( 2219-Al ) specimens with excellent mechanical properties were fabricated by laser-Tungsten Inert Gas ( TIG ) hybrid additive manufacturing .
 concept or principle: mechanical properties; concept or principle: fabricated; concept or principle: Inert Gas; manufacturing process: TIG; manufacturing process: additive manufacturing
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: mechanical properties, fabricated, Inert Gas, TIG, additive manufacturing 
Answer:
 concept or principle: mechanical properties; concept or principle: fabricated; concept or principle: Inert Gas; manufacturing process: TIG; manufacturing process: additive manufacturing