With the bulk of its manufacturing facilities in southern China, the company delivered record revenues and profit in 2012, boosted by strong sales of power tools and floor care products in the U.S. and European markets.

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The Thresher sank toward the ocean floor after losing power, until it imploded below crush depth into thousands of pieces.

WSJ: Work stalled on Thresher memorial park in Maine

The air vents to their home had been blocked by heavy snow and exhaust fumes from a power generator engulfed the ground floor.

BBC: Carbon monoxide detector