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- 26 May 2006
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Hi,
http://www.google.co.ve/patents/US1259083
https://www.google.com/patents/US1754817?dq=covino+aircraft&hl=ar&sa=X&ved=0ahUKEwiO6dOfqujKAhWCMBoKHVXDBn0Q6wEIHjAA
https://www.google.com/patents/US1348983?dq=covino+aircraft&hl=ar&sa=X&ved=0ahUKEwiO6dOfqujKAhWCMBoKHVXDBn0Q6wEIJzAB
http://www.google.co.ve/patents/US1259083
https://www.google.com/patents/US1754817?dq=covino+aircraft&hl=ar&sa=X&ved=0ahUKEwiO6dOfqujKAhWCMBoKHVXDBn0Q6wEIHjAA
https://www.google.com/patents/US1348983?dq=covino+aircraft&hl=ar&sa=X&ved=0ahUKEwiO6dOfqujKAhWCMBoKHVXDBn0Q6wEIJzAB