1877 Me फोनोग्राफ Namak Upakarann Ka Avishkaar Kisne Kiya Tha ? 1877 में फोनोग्राफ नामक उपकरण का आविष्कार किसने किया था ?

1877 में फोनोग्राफ नामक उपकरण का आविष्कार किसने किया था ?

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