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The definition of the decibel is based on the measurement of power in telephony of the early 20th " century in the Bell System in the United States .
 organization: Bell System; location: United States
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 organization: Bell System; location: United States