510
The company is advised by Trevor Whittaker , inventor of the Oyster concept , and Stephen Salter , inventor of the Salter 's Duck .
 person: Trevor Whittaker; person: Stephen Salter; person: Salter
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 person: Trevor Whittaker; person: Stephen Salter; person: Salter