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2. Mean time between failures - Wikipedia

   en.wikipedia.org/wiki/Mean_time_between_failures

   The Mil-HDBK-217 reliability calculator manual in combination with RelCalc software (or other comparable tool) enables MTBF reliability rates to be predicted based on design. A concept which is closely related to MTBF, and is important in the computations involving MTBF, is the mean down time (MDT). MDT can be defined as mean time which the ...

3. Light switch - Wikipedia

   en.wikipedia.org/wiki/Light_switch

   A toggle light switch Internal components of a toggle switch. The toggle mechanism provides "snap-action" through the use of an "over-center" geometry. The design was patented in 1916 by William J. Newton and Morris Goldberg. [2] The switch actuator does not control the contacts directly, but through an intermediate arrangement of springs and ...

4. Incandescent light bulb - Wikipedia

   en.wikipedia.org/wiki/Incandescent_light_bulb

   The filament is visible as the mostly horizontal line between the vertical supply wires. A scanning electron microscope image of the tungsten filament of an incandescent light bulb Elaborate light in Denver, Colorado. An incandescent light bulb, incandescent lamp or incandescent light globe is an electric light with a filament that is heated ...

5. AOL Mail

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6. News, Politics, Sports, Mail & Latest Headlines - AOL.com

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   Discover the latest breaking news in the U.S. and around the world — politics, weather, entertainment, lifestyle, finance, sports and much more.

7. AOL Mail Help - AOL Help

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   You've Got Mail!® Millions of people around the world use AOL Mail, and there are times you'll have questions about using it or want to learn more about its features. That's why AOL Mail Help is here with articles, FAQs, tutorials, our AOL virtual chat assistant and live agent support options to get your questions answered.