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Patents

• German DE9701454*

• European EP0993657*

• United States US6231185*

• International PCT/DE1997/001454* and WO/1999/003066* for Canada, Japan, United States
  and European states: AT, BE, CH, DE, DK, ES, FI, FR, GB, GR, IE, IT, LU, MC, NL, PT, SE)

German patent applications:

• DE10008251A1, DE19601024A1, DE19800845A1