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The problem with that device is that it needs to be embedded in the ice. The ice at most major championships is not made from scratch. The ice makers come into an arena and work with existing ice.
But the thing that would really help curling is a hog-line violation tool. A Canadian University has patented a hog-line sensor a couple of years ago, but it does not seem to have made it into viable product... at least not from what I have seen.
http://www.usask.ca/communications/ocn/Apr21-00/research.html
(I personally think that they are stumbling over the wrong technology but that's just my opionion.)
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