UPSC Practice recommends 1870 :: W.V.Siemens, Founder of Siemens, Personally Supervised Laying of Telegraph Line Between Calcutta & London #IndiaGermany 
Courtesy: Twitter
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UPSC Practice recommends 1870 :: W.V.Siemens, Founder of Siemens, Personally Supervised Laying of Telegraph Line Between Calcutta & London #IndiaGermany
Courtesy: Twitter
