April 1981

April 1981: 18 companies

1. April 1981 1 companies

3. April 1981 2 companies

5. April 1981 3 companies

7. April 1981 2 companies

12. April 1981 2 companies

13. April 1981 2 companies

15. April 1981 1 companies

17. April 1981 1 companies

20. April 1981 1 companies

22. April 1981 1 companies

26. April 1981 2 companies