| 21. | Corrugated aluminum has replaced wood as aroofing material in recent years.
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| 22. | Until December 2007, this was a corrugated iron sheet building.
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| 23. | They are 12-15 feet tall, corrugated steel walls.
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| 24. | Cartridges are stored in brass corrugated cases or in zinc cylinders.
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| 25. | An outbuilding is built of railroad ties covered with corrugated roofing.
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| 26. | In some examples it has a corrugated surface of ripple marks.
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| 27. | In 1850, he patented the tapered and ribbed corrugated wheel.
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| 28. | The weatherboarding is vertical, and survives under the corrugated iron.
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| 29. | All these rear control surfaces were covered with corrugated stressed skin.
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| 30. | The gabled roofs are clad with corrugated iron, painted green.
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