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James A. Van Allen lab journal, September 1959-January 1961
Page 197
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10/19/60 Explorer VII continues to operate! The intended cut-off date was its first anniversary 10/13/1960. A Bulova electric clock powered by a mercury battery was intended to short the power supply. It has not operated in time, and it now seems very likely that it will not work at all, (since a reasonable tolerance on
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10/19/60 Explorer VII continues to operate! The intended cut-off date was its first anniversary 10/13/1960. A Bulova electric clock powered by a mercury battery was intended to short the power supply. It has not operated in time, and it now seems very likely that it will not work at all, (since a reasonable tolerance on
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