86490
CW became the standard method of transmitting radiotelegraphy by the 20 s , damped wave spark transmitters were banned by 1930 and CW continues to be used today .
 organization: CW
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: CW 
Answer:
 organization: CW