In rigorous testing, the Energy Department said, the bulb had a useful lifetime of more than 25, 000 hours.

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Thus it might prove more expedient to invest in this at least tried technology, which could extend the useful lifetime of nuclear power by hundreds of years.

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The Lifetime Learning credit is useful for grad school and night school tuition, and can be claimed over and over.

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To the contrary, in their useful lives they added exceptional shareholder value in earnings and lifetime contribution.

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