The sixth instalment of Harry Potter has given Hollywood studio Warner Bros. its seventh No.1 hit of the year and has pushed the studio's domestic gross past the $1 billion mark.

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The success of Harry Potter and the Half-Blood Prince comes on the heals of the studio's recent comedy The Hangover, which, with more than $235 million in ticket sales thus far, has become the highest-grossing R-rated comedy ever domestically.
Warner Bros. has said in a statement released on Sunday that it is the only studio to earn $1 billion annually for nine consecutive years.
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