tungsten is used for filament of electric lamps |
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tungsten is used for the filament of bulb |
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the tungsten is used for filament of electric lamps |
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tungsten is used for filament of electric bulb |
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tungsten is used for filament of incandescent lamps |
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tungsten is used for the filament in electric bulbs |
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tungsten is used almost for a filament of electric lamp |
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