Science and Technology · Inventions and Discoveries
1887 में लेटरल-कट फ्लैट डिस्क ग्रामोफोन रिकॉर्ड का पेटेंट किसने कराया था?
Verified Solution4 OptionsUpdated: October 2026👁️1 View
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- 1गुग्लिएल्मो मार्कोनी
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- 3अलेक्जेंडर ग्राहम बेल
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