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Annoying cellphone rings?

N.K.

A Hong Kong company hopes to sell signal jamming technology previously used by the military to thwart lethal missiles to block annoying cellphone calls in places such as hospitals, places of worship and restaurants.

"This is a way to enforce the etiquette of mobile phone usage where polite persuasion has failed," said Paul Kan, chairman of Champion Technology Holdings Ltd., at the launch of its MuteTone product .

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