[['satellite', 'launch date (utc)', 'decay', 'mass (kg)', 'diameter (m)', 'nssdc id', 'nation', 'usage'], ['echo 1', '1960 - 08 - 12 09:36:00', '1968 - 05 - 24', '180', '30.48', '1960 - 009a', 'us', 'pcr , ado , spc , tri'], ['explorer 9', '1961 - 02 - 16 13:12:00', '1964 - 04 - 09', '36', '3.66', '1961 - 004a', 'us', 'ado'], ['explorer 19 (ad - a)', '1963 - 12 - 19 18:43:00', '1981 - 10 - 05', '7.7', '3.66', '1963 - 053a', 'us', 'ado'], ['echo 2', '1964 - 01 - 25 13:55:00', '1969 - 06 - 07', '256', '41', '1964 - 004a', 'us', 'pcr , tri'], ['explorer 24 (ad - b)', '1964 - 11 - 21 17:17:00', '1968 - 10 - 18', '8.6', '3.6', '1964 - 076a', 'us', 'ado'], ['pageos 1', '1966 - 06 - 24 00:14:00', '1975 - 07 - 12', '56.7', '30.48', '1966 - 056a', 'us', 'tri'], ['explorer 39 (ad - c)', '1968 - 08 - 08 20:12:00', '1981 - 06 - 22', '9.4', '3.6', '1968 - 066a', 'us', 'ado'], ['mylar balloon', '1971 - 08 - 07 00:11:00', '1981 - 09 - 01', '0.8', '2.13', '1971 - 067f', 'us', 'ado'], ['qi qiu weixing 1', '1990 - 09 - 03 00:53:00', '1991 - 03 - 11', '4', '3', '1990 - 081b', 'prc', 'ado'], ['qi qiu weixing 2', '1990 - 09 - 03 00:53:00', '1991 - 07 - 24', '4', '2.5', '1990 - 081c', 'prc', 'ado']]
the Qi Qiu Weixing 1 and 2 were launched the same day
the [ENT] and [ENT] were launched the same day