Pat J. O'Brien was an actor from the 1920s to the 1940s. He is often mistaken for the famous Warner Bros. actor (because surprisingly, he was almost always billed as simply "Pat O'Brien", something that is normally never done with two actors who are active at the same time) and some of his movies (which were mostly serials and westerns) include: Doomed Caravan, Bar 20 Justice, and Tim Tyler's Luck. If anyone knows more about this person, please e-mail us and we will post it here.
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