| 21. | The optional retractable pen-holder eliminates " retrace lines ".
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| 22. | It also had retractable landing gear, including the tail wheel.
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| 23. | Similar, but retractable, leading edge devices are called slats.
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| 24. | The conventional undercarriage, including the tailwheel, was fully retractable.
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| 25. | Subsequently, the planned retractable roof for the stadium was canceled.
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| 26. | In late 2014, construction of the planned retractable roof resumed.
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| 27. | Commonly the entrance to the voting booth is a retractable curtain.
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| 28. | Retractable wheels were allowed by 1970 and water ballast by 1972.
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| 29. | The YO-3 has retractable tailwheel-type landing gear.
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| 30. | Toyota introduced a modern retractable hardtop, the MZ20 Soarer Aerocabin.
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