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For example, a tungsten light bulb filament generates heat, so it would have a positive nonzero value for "q" when turned on.
en.wikipedia.org When the image was to be erased, current was applied to the tungsten layer; even very dark images could be erased in 510 seconds.
en.wikipedia.org Chromium, molybdenum, vanadium, and tungsten are added for excellent sharpness and edge retention.
en.wikipedia.org Thinking that it was an unknown mineral containing the newly discovered element tungsten, he named it ytterbite.
en.wikipedia.org It consisted of a brass shank into which a very hard and strong tungsten wire, somewhat narrower than the standard record groove, had been fitted.
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