Science and Technology · Inventions

पहले व्यावहारिक, स्वतंत्र रूप से संचालित लाउडस्पीकर, जिसे 'ऑक्सोटोफोन' (Auxetophone) के रूप में जाना जाता है, का आविष्कार किसने किया था?

Verified Solution4 OptionsUpdated: October 2026👁️1 View

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