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The method described and involved advancing a rotating non-consumable rod ( CP Mo or AISI 304 ) toward the upper sheet of a metallic stack clamped under pressure .
 machine or equipment: rod; material: Mo; material: AISI 304; material: sheet; material: metallic stack; concept or principle: pressure
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:
 machine or equipment: rod; material: Mo; material: AISI 304; material: sheet; material: metallic stack; concept or principle: pressure