Filament of a light bulb. Coloured scanning electron micrograph (SEM) of the double coiled tungsten wire filament of a 60 Watt domestic light bulb. Magnification: x60 at 6x7cm size. x148 at 8x6,x78 at 10x7cm master size"

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TOP10228269

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達志影像

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RM

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須由TPG 完整授權

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