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This network was ended when telegraphy became more widely available.
en.wikipedia.org He held a childhood interest in electricity and later wireless telegraphy which led to a career in radio technology.
en.wikipedia.org The most common uses were as recording equipment for seismometers and submarine cables used for telegraphy.
en.wikipedia.org Before the introduction of dynamo electric machines, voltaic, or primary, batteries were extensively used for electro-plating and in telegraphy.
en.wikipedia.org His writings included allusions to spiritualism as a form of telegraphy.
en.wikipedia.org