In 1977 , frustrated by regulatory blocks that prevented him from expanding into the Sydney market , Murdoch sold WIN .
In 1977 , frustrated by regulatory blocks that prevented him from expanding into the Sydney market , Murdoch purchased a 46 % share in Ten Sydney .
In 1977 , frustrated by regulatory blocks that prevented him from expanding into the Sydney market , Murdoch sold WIN and purchased a 46 % share in Ten Sydney .