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Durst sued EFI for allegedly infringing German patent No. 10 2005 006 092. In addition to denying those allegations, EFI filed a nullity action in the Federal Patent Court of Germany, asking that court to invalidate the portions of the patent asserted against EFI on the grounds that what Durst claimed had actually been disclosed years before. German courts in Mannheim and Karlsruhe had already held a Durst utility model claiming the same "invention" invalid for similar reasons.
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