| 21. | Rows of brightly colored hard hats which visitors must wear are another tipoff.
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| 22. | Six workmen in hard hats hammered nails into the stadium floor.
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| 23. | Hard hats are worn to protect the head from bumps and falling rocks.
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| 24. | Did any Rosie the Riveter were a hard hat while on her job?
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| 25. | They're at once lively and lifeless : pharaohs in hard hats.
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| 26. | Woods joked that he needed a hard hat to play at Dad Miller.
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| 27. | Hard hats and power tools were still in use last week.
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| 28. | His scriptwriting includes the short film " Hard Hat ".
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| 29. | Many of the workers slowly took off their hard hats and bowed their heads.
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| 30. | One day I expect him to make a hard hat out of an armadillo.
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