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British American Tobacco said on Thursday that it sued Philip Morris International Inc in the United States and Germany, alleging that the tobacco heating technology used in its bigger rival’s IQOS devices infringed its patents. The lawsuits in Germany and the United States focus on the heating blade technology used in IQOS, which BAT said was an earlier version of the technology currently being used in its glo tobacco heating devices. BAT has laid out plans to launch glo range of products in Germany this year.