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Fire alarm warning system. Historical illustration of a firefighter receiving a call from a telephone-based French street fire alarm system. Systems like this were used in the early 20th century to summon firefighters to a fire before the development of a public telephone network. For the street fire alarm used to make the call, see image C024/6473. Artwork from 'Electricite' (1911) by Max de Nansouty, part of the 'Les merveilles de la science' series of 1867-1891 by Louis Figuier.
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