TANDEM

DATES

13 December 1971
1972
July 1972
October 1972
20 May 1974
1975
February 1975
Approx. November 1975
November 1975
December 1975
December 1975
1978
1978
1978
1 January 1979
1980
February 1980
1 April 1980

ETAPES

13 December 1971 - 20 May 1974
20 May 1974 - 1977
1978 - 1 April 1980