| 21. | These oil rigs were first made by Henry L . Williams in 1896.
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| 22. | Jess goes into labour early while Jago is still on the oil rig.
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| 23. | No casualties were immediately reported but an oil rig was gutted, officials said.
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| 24. | Figure 1 shows the result of a 2002 study on offshore oil rigs.
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| 25. | The trade balance figures exclude sales of ships and oil rigs.
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| 26. | Gas below the surface is a known hazard for oil rigs.
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| 27. | There are lots of hazards, from mines to offshore oil rigs.
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| 28. | In such depths, it is impossible to build fixed oil rigs.
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| 29. | A guy who works on an oil rig brought that in.
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| 30. | Fox said, drumming up support among workers on an offshore Pemex oil rig.
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