Past a guarded gate on the outskirts of this city sits one of the world’s largest factories. In dozens of squat buildings, it churns out gadgets bearing technology’s household names—Apple Inc.’s iPods and iPhones, Hewlett-Packard Co.’s personal computers, Motorola Inc. mobile phones and Nintendo Co. Wii videogame consoles.

Few people outside of the industry know of the plant’s owner: Hon Hai Precision Industry Co. With a work force of some 270,000—about as big as the population of Newark, N.J

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