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Marc Isambard Brunel ( father of Isambard Kingdom Brunel ) , with the help of Henry Maudslay and others , designed 22 types of machine tools to make the parts for the rigging blocks used by the Royal Navy .
 Marc Isambard Brunel, Isambard Kingdom Brunel, Henry Maudslay, Royal Navy
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: media, plant, vehicle, astronomical object, time, disease, animal, location, person, organization, mythical figure, food, biology, geographical phenomenon, instrument, event 
Text: {0} 
Answer:
 Marc Isambard Brunel, Isambard Kingdom Brunel, Henry Maudslay, Royal Navy