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Raziel 2013-11-28 05:21 PM

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poiu 2013-11-28 05:23 PM

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¥¤ªo»Í 2013-11-28 08:43 PM

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OFUE 2013-11-29 12:04 AM

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Raziel 2013-11-29 06:57 AM

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http://en.wikipedia.org/wiki/Heinrich_Hertz

In 1930 the International Electrotechnical Commission (IEC) honored Hertz by naming the unit of frequency¡Xone cycle per second¡Xthe "hertz".


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