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| US5954940 | 30 Jun 1997 | 21 Sep 1999 | American Air Liquide Inc. | Method for measuring coating quality |
| US6106693 | 1 Jul 1999 | 22 Aug 2000 | American Air Liquide Inc. | Method for measuring coating quality |
| US6207030 | 19 Jun 2000 | 27 Mar 2001 | American Air Liquide Inc. | Apparatus for measuring coating quality |
