| 11. | Some extension ladders have spikes attached to the side rails.
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| 12. | If you have a high roof, you'll have to set up an extension ladder.
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| 13. | They just can't be on a 20-foot extension ladder.
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| 14. | Of course, you will have to erect an extension ladder to get at the roof.
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| 15. | The protesters from the environmental group Greenpeace used an extension ladder to reach the roof.
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| 16. | Henry Quackenbush patented the extension ladder in 1867.
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| 17. | I was carrying an extension ladder, trying to go between the cars and stepping over some junk.
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| 18. | Each craft also carried tubular-steel extension ladders made up of light, four-foot sections suitable for quick assembly.
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| 19. | You will have to raise an extension ladder to paint the upper story or clean the gutters.
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| 20. | Using a stepladder requires the same precautions as with an extension ladder, with just a few modifications.
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