Twin vertical-axis wind turbine with automatic wind tracking
Claims
The ornamental design for a twin vertical-axis wind turbine with automatic wind tracking, as shown and described.
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Type: Grant
Filed: Dec 12, 2011
Date of Patent: Feb 4, 2014
Inventor: Dennis Patrick Steel (Moers)
Primary Examiner: Derrick Holland
Assistant Examiner: Lauren Calve
Application Number: 29/408,349