original Patent - Adolf Rockel , Berlin / Schà neberg , 1901 , Zeitstromschlieà er für Beleuchtung von Treppen durch Gas

Published by Patentinhaber:ÂAdolf Rockel in Berlin / Schà nebergPatent:ÂZeitstromschließer für zeitweise Beleuchtung von Treppen durch GasPatentiert am:Â10.08.1901P-198
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