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The Gallery of Technological wonders
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Lamp with a filament of tantalum
In 1904 the first metal filament lamp with a filament of tantalum was successfully manufactured by W. Bolton at Siemens & Halske. Its luminous efficiency was 6 lm/W.
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Siemens S.p.A. 1999 - Milano
Communication and Marketing
Reproduction and use of the images and texts are prohibited.
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