April 1980

April 1980: 72 companies

2 April 1980 1 companies

10 April 1980 1 companies

13 April 1980 5 companies

14 April 1980 1 companies

15 April 1980 1 companies

17 April 1980 60 companies

20 April 1980 1 companies

21 April 1980 1 companies

24 April 1980 1 companies