earphone Di Khoj Kisne ki thi in Punjabi language.
ram4441:
what
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ਕੇਅਰਫੋਨ ਦੀ ਖੋਜ ਕੀਤੀ ਗਈ ਕੱਟੜਪੰਥੀ ਮਾਰਮਨ ਅਤੇ ਇੰਜੀਨੀਅਰ ਨਾਥਨੀਏਲ ਬਾਲਡਵਿਨ
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Nathaniel Baldwin, who invented earphone
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