7250
The British high-definition TV service started trials in August 1936 and a regular service on 2 November 1936 using both the ( mechanical ) Baird 240 line and ( electronic ) Marconi-EMI 405 line ( 377i ) systems .
 None
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:  
Answer:
 None