Original Patentschrift - Richard Rathsmann in Penig i.S., 1891 , Rechenmaschine für Triebwerk , Schule , Instrument !!!

Published by Patentinhaber: Richard Rathsmann in Penig i.S.Patent: Rechenmaschine zur Bestimmung der Verhältniszahlen vonTriebwerkenPatentiert am:  21.03.1891W39 
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