april 1957

april 1957: 139 companies

1 april 1957 5 companies

3 april 1957 16 companies

4 april 1957 4 companies

5 april 1957 5 companies

7 april 1957 2 companies

8 april 1957 3 companies

9 april 1957 5 companies

10 april 1957 4 companies

11 april 1957 2 companies

12 april 1957 8 companies

14 april 1957 9 companies

15 april 1957 5 companies

19 april 1957 4 companies

21 april 1957 8 companies

23 april 1957 9 companies

24 april 1957 7 companies

25 april 1957 10 companies

26 april 1957 7 companies

27 april 1957 1 companies

28 april 1957 6 companies

29 april 1957 9 companies

30 april 1957 10 companies