April 1980

April 1980: 889 companies

April 1, 1980 23 companies

April 2, 1980 33 companies

April 3, 1980 35 companies

April 8, 1980 13 companies

April 9, 1980 47 companies

April 10, 1980 38 companies

April 11, 1980 74 companies

April 14, 1980 51 companies

April 15, 1980 48 companies

April 16, 1980 54 companies

April 17, 1980 47 companies

April 18, 1980 36 companies

April 21, 1980 48 companies

April 22, 1980 63 companies

April 23, 1980 53 companies

April 24, 1980 61 companies

April 28, 1980 40 companies

April 29, 1980 64 companies

April 30, 1980 61 companies