Google Inc. is developing a new, cutting-edge tablet as it continues to experiment with advanced vision capabilities for mobile devices.

The company plans to produce about 4,000 of the prototype tablets beginning next month, according to people briefed on the company's plans. The device would come with a 7-inch screen and will be equipped with two back cameras, infrared depth sensors and advanced software that can capture precise three-dimensional images of objects, said these people.

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