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Re:Twitter’s Surprising Solution to the Patent Problem: Let ... by Swizec on Thursday February 21, 2013 @10:29AM (#5257916)
I am almost certain aircon buttons are patented.

For instance: "Control device for motor vehicle air conditioning, with driver preferences settings"

http://www.google.com/patents/EP0908338A1?cl=en&dq=car+d...

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