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| US5195392 | 14 mai 1990 | 23 mars 1993 | Niagara Mohawk Power Corporation | Internal pipe inspection system |
| US5329824 | 15 juil. 1993 | 19 juil. 1994 | Niagara Mohawk Power Corporation | Centralizer for internal pipe inspection device |
| US6016609 | 30 sept. 1997 | 25 janv. 2000 | | Eze glide fish tape reel assembly |
| US6615440 | 27 sept. 2001 | 9 sept. 2003 | | Plumbing snake diverting apparatus |
