3479335 Contact breaker, 1850; (add.info.: Helmholtz\'s contact breaker. From Robert Brown Science for all, London, n.d. Hermann Ludwig Ferdinand von Helmholtz (August 31, 1821 - September 8, 1894) was a German physician and physicist who made significant contributions.); Universal History Archive/UIG; out of copyright.
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19thcentury19centuryXIXcenturyXIXthcenturycommunicationcommunicationselectricityelectricelectriciteLondonlondonerEnglandenglishGreatBritainbritishBritainGBunitedkingdomUKEuropeeuropeanscienceelectricalcontactelectricsciencerobertbrownbreakerelectrical19thcenturyelectricitycontactlondoncommunicationhelmholtzsciencerobertbrownbreakerelectrical19thcenturyelectricitycontactlondoncommunicationhelmholtz
1919th19th19thBritainBritainEnglandEuropeGBGreatLondonUKXIXXIXthbreakerbreakerbritishbrownbrowncenturycenturycenturycenturycenturycenturycommunicationcommunicationcommunicationcommunicationscontactcontactcontactelectricelectricelectricalelectricalelectricalelectriciteelectricityelectricityelectricityenglisheuropeanhelmholtzhelmholtzkingdomlondonlondonlondonerrobertrobertsciencesciencescienceunited
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