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1880 - 1934 1935 - 1955 1956 - 1961 1962 - 1990 1991 - 2000 collective bargaining English

1880 - 1929 1930 - 1939 1940 - 1941 1942 - 1980 1981 - 2000 bargaining collectively English

1880 - 1920 1921 - 1965 1966 - 1971 1972 - 1994 1995 - 2000 collectively bargaining English

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1880 - 1934	1935 - 1955	1956 - 1961	1962 - 1990	1991 - 2000	collective bargaining	English
1880 - 1929	1930 - 1939	1940 - 1941	1942 - 1980	1981 - 2000	bargaining collectively	English
1880 - 1920	1921 - 1965	1966 - 1971	1972 - 1994	1995 - 2000	collectively bargaining	English