| 11. | They will also be building the airships in the United States.
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| 12. | Unlike semi-rigid and rigid airships ( e . g.
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| 13. | Another more recent theory involves the airship's outer covering.
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| 14. | During the war, the British operated over 200 nonrigid airships.
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| 15. | In the 1990s the Zeppelin company returned to the airship business.
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| 16. | Lewis guns were also carried as defensive guns on British airships.
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| 17. | Several hydrogen airships had crashed in similar circumstances without catching fire.
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| 18. | The company also makes airships, helium balloons and static inflatables.
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| 19. | In the late 1920s, emphasis shifted from airships to balloons.
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| 20. | The great Zeppelin airships of the twentieth century were rigid types.
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