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• 6,607,768
• 6,207,211
• 6,106,877
• 5,939,121
• 5,721,005
• 5,322,703
• 5,292,005
• 5,257,574
• 5,185,171
• 4,988,590
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• JP 2007300937A
• EP 0405648B1