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Back in 1968 TRW proposed that the last spacecraft in the series Pioneer A-E be modified so that it could be used as the first Venus Orbiter. Mission objectives included a study of the solar winds interaction with the Venusian environment.
http://ntrs.nasa.gov/archive/nasa/casi.ntrs.nasa.gov/19740075014_1974075014.pdf
http://ntrs.nasa.gov/archive/nasa/casi.ntrs.nasa.gov/19740075014_1974075014.pdf