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persona esperta
weld.	専門家 (せんもんか); 有資格者 (ゆうしかくしゃ); 熟練者
persona esperta in campo elettrico
el., sec.sys.	電気取扱者; 作業指導者
persona esperta nel campo delle attività elettriche
el.mach.	電気の熟練者