<Ol> <Li> Bernard Freyberg, Baron Freyberg, Governor - General of New Zealand (1946--1952) </Li> <Li> Sir Humphrey O'Leary, Administrator of the Government of New Zealand (1952) </Li> <Li> Sir Willoughby Norrie, Governor - General of New Zealand (1952--1957) </Li> </Ol> <Li> Bernard Freyberg, Baron Freyberg, Governor - General of New Zealand (1946--1952) </Li> <Li> Sir Humphrey O'Leary, Administrator of the Government of New Zealand (1952) </Li> <Li> Sir Willoughby Norrie, Governor - General of New Zealand (1952--1957) </Li>

Who became new zealand's head of state in 1952