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Pal investigated the effect of post-processing and machining process parameters on the mechanical properties of stainless steel product produced by direct laser sintering .
 concept or principle: post-processing; manufacturing process: machining; concept or principle: parameters; concept or principle: mechanical properties; material: stainless steel; manufacturing process: laser sintering
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:
 concept or principle: post-processing; manufacturing process: machining; concept or principle: parameters; concept or principle: mechanical properties; material: stainless steel; manufacturing process: laser sintering