Question

who discovered tungsten filament lamp? ​

Answer 1

Answer:

On 13 December 1904, Hungarian Sándor Just and Croatian Franjo Hanaman were granted a Hungarian patent (No. 34541) for a tungsten filament lamp that lasted longer and gave brighter light than the carbon filament. Tungsten filament lamps were first marketed by the Hungarian company Tungsram in 1904.

Explanation:

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Answer 2

Answer:

William D. Coolidge.

Explanation:

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