91404
Attempts at using normal telephony networks to transmit slow-scan video , such as the first systems developed by AT&T Corporation , first researched in the 1950 s , failed mostly due to the poor picture quality and the lack of efficient video compression techniques .
 organization: AT&T Corporation
Given options, please tell me the categories of all the listed entity words.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} 
 Entities: AT&T Corporation 
Answer:
 organization: AT&T Corporation