US6547337B2 US09/942,141 US94214101A US6547337B2 US 6547337 B2 US6547337 B2 US 6547337B2 US 94214101 A US94214101 A US 94214101A US 6547337 B2 US6547337 B2 US 6547337B2 Authority US United States Prior art keywords wheel trencher rock saw plate rock Prior art date 2001-08-29 Legal status (The legal status is an assumption and is not a legal conclusion.
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