original Patent - Carl Ruhfus , H. Dankers in Dortmund , 1886 , Elektrisches Anzeigewerk für Thermometer | Elektromagnet

Published by Patentinhaber:ÂCarl Ruhfus und H. Dankers in DortmundÂPatent:ÂElektrisches Anzeigewerk für ThermometerPatentiert am:Â03.06.1886 P-173
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