Campbell Harris Helicopters & Autogiro Company of America

[hesham]

Hi;

https://www.google.st/patents/US2877856?dq=campbell+harris+autogiro&hl=pt-PT&sa=X&ved=0ahUKEwirnOGYjcfPAhXrDsAKHYbfDYUQ6AEIYjAI

https://www.google.st/patents/US2659551?dq=campbell+harris+autogiro&hl=pt-PT&sa=X&ved=0ahUKEwirnOGYjcfPAhXrDsAKHYbfDYUQ6AEILDAC

https://www.google.st/patents/US1980980?dq=campbell+harris+autogiro&hl=pt-PT&sa=X&ved=0ahUKEwirnOGYjcfPAhXrDsAKHYbfDYUQ6AEINTAD

https://www.google.st/patents/US2344966?dq=campbell+harris+autogiro&hl=pt-PT&sa=X&ved=0ahUKEwirnOGYjcfPAhXrDsAKHYbfDYUQ6AEIPjAE

https://www.google.st/patents/US2776016?dq=campbell+harris+autogiro&hl=pt-PT&sa=X&ved=0ahUKEwirnOGYjcfPAhXrDsAKHYbfDYUQ6AEIRzAF

https://www.google.st/patents/US2672939?dq=campbell+harris+autogiro&hl=pt-PT&sa=X&ved=0ahUKEwiixtG9jsfPAhWHAcAKHZpcBrY4ChDrAQg-MAQ

https://www.google.st/patents/US2122450?dq=campbell+harris+autogiro&hl=pt-PT&sa=X&ved=0ahUKEwiixtG9jsfPAhWHAcAKHZpcBrY4ChDoAQhYMAc

https://www.google.st/patents/US2330204?dq=campbell+harris+autogiro&hl=pt-PT&sa=X&ved=0ahUKEwiii8iBj8fPAhUlKcAKHSd7DB04FBDrAQgaMAA

 

[hesham]

And;

https://www.google.st/patents/US2330204?dq=campbell+harris+autogiro&hl=pt-PT&sa=X&ved=0ahUKEwiii8iBj8fPAhUlKcAKHSd7DB04FBDrAQgaMAA