হেডফোন কে তৈরি করেছেন ?

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হেডফোন কে তৈরি করেছেন ?

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parasite · Answer 1 · 2021-03-25T08:21:20+0000

Nathaniel Baldwin of Utah in 1910 invented a prototype telephone headset due to his inability to hear sermons during Sunday service. He offered it for testing to the US Navy, which promptly ordered 100 from Baldwin.

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হেডফোন কে তৈরি করেছেন ?

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