Talk:Piasecki H-21

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development history problems ?

Perhaps it would be worth noting that development was costly (money, test pilots), for reference:youtube video — Preceding unsigned comment added by 94.112.108.225 (talk) 18:51, 15 August 2012 (UTC)

Youtube is not really a reliable source. MilborneOne (talk) 13:17, 17 August 2012 (UTC)

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Last modified on 17 August 2012, at 13:18