April 1980

April 1980: 214 companies

April 1, 1980 39 companies

April 2, 1980 6 companies

April 5, 1980 1 companies

April 8, 1980 14 companies

April 9, 1980 6 companies

April 10, 1980 7 companies

April 11, 1980 7 companies

April 12, 1980 1 companies

April 14, 1980 12 companies

April 15, 1980 9 companies

April 16, 1980 11 companies

April 17, 1980 5 companies

April 18, 1980 7 companies

April 19, 1980 1 companies

April 20, 1980 3 companies

April 21, 1980 10 companies

April 22, 1980 6 companies

April 23, 1980 17 companies

April 24, 1980 7 companies

April 25, 1980 10 companies

April 26, 1980 1 companies

April 28, 1980 8 companies

April 29, 1980 11 companies

April 30, 1980 15 companies