The Secret Life of the Telephone
The forerunner of the telephone was the telegraph. By 1870 all major towns in Europe and America had telegraphs, sending messages in 'on' and 'off' pulses (e.g. Morse code). It was while trying to improve the telegraph that Bell discovered the telephone.
heating system washing
SERIES 2: car internal combustion engine quartz watch telephone radio set video recorder
SERIES 3: fax machine lift word processor electric light photocopier the office
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