6072
By 1837 , William Fothergill Cooke and Charles Wheatstone had co-developed a telegraph system which used a number of needles on a board that could be moved to point to letters of the alphabet .
 person: William Fothergill Cooke; person: Charles Wheatstone
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: William Fothergill Cooke, Charles Wheatstone 
Answer:
 person: William Fothergill Cooke; person: Charles Wheatstone