This OTF automatic knife made by Microtech has a double-edge, one side is plain & the other is fully serrated. It goes for over $300.
This second knife is From Gerber. It goes for about $26.
This third one is made by Syderco, it's called the micro-dyad. It goes for about $100.
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....he felt the prompting of his heritage, the desire to possess, the wild danger-love, the thrill of battle, the power to conquer or to die. Jack London