Mariner 5 - USA Venus Flyby - 244 kg - had been launched on June 14, 1967.
Mariner 5 arrived at Venus on October 19, 1967, one day after Venera 4. It passed within 3,900 kilometers of the planet's surface.
It studied the Venusian magnetic field and found that its atmosphere was composed of 85-99% carbon dioxide. It is now in a solar orbit.
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