The original text of the Constitution, established in 1919, has been modified by the amendment of 1922 which entered into force on 4 June 1934; the Instrument of Amendment of 1945 which entered into force on 26 September 1946; the Instrument of Amendment of 1946 which entered into force on 20 April 1948; the Instrument of Amendment of 1953 which entered into force on 20 May 1954; the Instrument of Amendment of 1962 which entered into force on 22 May 1963; and the Instrument of Amendment of 1972 which entered into force on 1 November 1974.
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ILO_Constitution.pdf