Telephone-telegraph invention. Artwork of a telegraph key (orange) and a coiled strip of paper tape, labelled 'think differently!'. This represents how inventions can arise when thinking differently about the technology previously in use. The development of electric telegraphy from the 1830s led to the creation of a large telecommunication network based on punched paper tape records. It was not thought that there was any need to transmit sound and voices, until Alexander Graham Bell and others invented telephone technology in the 1870s.
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