Remember CAT? No, not our feline overlords but the makers of rugged manufacturing equipment and machines. Unless you haven't been tracking our smartphone coverage, you will probably be aware that it also makes equally rugged smartphones to match the extreme working environment they put their products through. Now the company is bringing its latest model, the 4-inch B15Q and the larger 4.7-inch S50, to the US though the price tags on these might be a bit discouraging for everyday consumers. But then again, these aren't your everyday smartphones anyway.