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20191024ensp0183enspThe first microphone that enabled proper voice telephony was the (loosecontact) carbon microphone.This was independently developed by David Edward Hughes in England and Emile Berliner and Thomas Edison in the US. Although Edison was awarded the first patent (after a long legal dispute) in mid1877, Hughes had demonstrated his working device in front of many witnesses some years
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government of india central public works department 2009 cpwd specifications (vol. 2) published by director general of works, cpwd, nirman bhawan, new delhi
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2019726ensp0183enspIssuu is a digital publishing platform that makes it simple to publish magazines, catalogs, newspapers, books, and more online. Easily share your publications and get them in front of Issuus
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