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→Patente
*[https://patents.google.com/patent/US9912031B2/en US 9912031 B2]
*[https://patents.google.com/patent/US9912031B2/en US 9912031 B2]
*[https://patents.google.com/patent/US7969042 US 7969042]
*[https://patents.google.com/patent/US7969042 US 7969042]
*[https://www.google.com/patents/US20140252886 US20140252886]
==Weblinks==
==Weblinks==