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The next major technical development was the invention of the gramophone record , generally credited to Emile Berliner and patented in 1887 , though others had demonstrated similar disk apparatus earlier , most notably Alexander Graham Bell in 1881 .
 person: Emile Berliner; person: Alexander Graham Bell
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: media, plant, vehicle, astronomical object, time, disease, animal, location, person, organization, mythical figure, food, biology, geographical phenomenon, instrument, event 
Text: {0} 
Answer:
 person: Emile Berliner; person: Alexander Graham Bell