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| Document Number | Assignee | Inventors | Issue/Pub Date |
|---|---|---|---|
| US6085549 | Messer Griesheim Industries, Inc. | Paul A. Daus et al. | Jul 2000 |
| US5693121 | Enerfex, Inc. | Richard A. Callahan et al. | Dec 1997 |
| US6128919 | Messer Griesheim Industries, Inc. | Paul A. Daus et al. | Oct 2000 |