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Although the 18,000 - psi regulation had been safely enacted in other cities , Mayor Jimmy Walker did not sign the new codes into law until March 26 , 1930 , just before construction was due to commence .
 Jimmy Walker
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Jimmy Walker