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It's about a way of bonding surfaces together as seamlessly as possible.

Basically, a thin composite layer with glue built into it.

One application example they gave is for placing a ceramic or plastic radio-wave-transparent material in a location cut out of a non-radio-transparent metal back.

The idea is to be able to do such things without customers complaining about looks or feelable joints.
 
It would eliminate the seams between different materials like the back of the original iPhone or like the black plastic piece on the top of the 3G iPads.
In other words, areas that need to be RF conductive can be seamlessly built into materials that aren't.
 
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