Piasecki H-21
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Piasecki Helicopter
List of rotorcraft
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Piasecki
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List of Polish Americans
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Boeing Rotorcraft Systems
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Du Pont family
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Boeing Defense, Space & Security
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HMX-1
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Laurance Rockefeller
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Vought OS2U Kingfisher
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Rockefeller family
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Boeing CH-47 Chinook
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Boeing Vertol CH-46 Sea Knight
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Piasecki Helicopter Corporation
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