Vibrating pry-bar - This would vibrate quickly to remove wood surrounding the nail and then extract the nail with the pry-bar.
The rounder - The specially designed drill would be centered over the nail and drill it out.
The claw - The claw opens as it is driven at the nail. The claw then closes around the shaft of the nail and extracts it.
The nail expander - Driven into nail and then burrs are extended to grab the nail and put it out.
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