on march 3 , 1847, Elexander Graham Bell was born in Edinburgh. he was a Scotman although he later emigrated, first to Canada and then to USA in the 1870s In America, he worked with deaf-mutes at Boston University . soon, bell started experimenting with ways of trasmitting speech over a long distance. this led to the invention of the telephone .
đang được dịch, vui lòng đợi..