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Ned Steinberger introduced a headless bass in 1979 and continued his innovations in the 1980 s , using graphite and other new materials and ( in 1984 ) introducing the TransTrem tremolo bar .
 person: Ned Steinberger
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: location, person, organization 
Text: {0} 
 Entities: Ned Steinberger 
Answer:
 person: Ned Steinberger