Focusing on high-margin drilling technology and tools, Duroc-Danner spun off the drill-pipe business as Grant Prideco in 2000 and sold off capital-intensive barge rig and gas-compression businesses.

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Focusing on high-margin drilling technology and tools, Duroc-Danner spun off the drill-pipe business as Grant Prideco (nyse: GRP - news - people ) in 2000 and sold off capital-intensive barge rig and gas-compression businesses.

FORBES: Oil Gleaners