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Coherer, c 1900.
Filing coherer used by Sir Oliver Lodge, 1894.
An early coherer, 1894. A coherer is an ear
An early coherer, 1894. A coherer is an ear
An early coherer, 1894. A coherer is an ear
Marconi coherer and tapper, 1900.
Marconi Coherer and tapper, 1900.
Marconi coherer and tapper, 1900.
Coherer, 1894, bas-relief of Guglielmo Marconi, 1903, and locket, c 1916.
Wireles receiver (coherer) , 1897.
Women office workers using a filing system at a railway station store, 1936.
Herman Hollerith, American inventor, 1900-1910.
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