original Patent - Carl Ruhfus , H. Dankers , Dortmund , 1887 , Elektrisches Anzeigewerk für Thermometer , Elektromagnet

Published by Patentinhaber: Carl Ruhfus und H. Dankers in DortmundPatent: Elektrisches Anzeigewerk für ThermometerPatentiert am: 02.03.1887P-114
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