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October 31, 2014

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In this Tuesday, Oct. 1, 2013, file photo, the Nest smoke and carbon monoxide alarm is shown at the company's offices, in Palo Alto, Calif.

AP Photo/Marcio Jose Sanchez

In this Tuesday, Oct. 1, 2013, file photo, the Nest smoke and carbon monoxide alarm is shown at the company's offices, in Palo Alto, Calif.