Found a this as well. Also seems like I remember reading something about Mitsubishi Japan licensing some one to produce 4G engines a while back I believe that it was Doosan/Daewoo which is referenced in this article.
globenewswire. com/news-release/2014/12/09/689829/10111601/en/Video-Release-Power-Solutions-International-Launches-Gas-Engine-Joint-Venture-With-Doosan-Infracore. html
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