original Patent - G. Fecker , H. Boecker , Fecker & Comp. , Wetzlar 1886 , Federregulator für Astronomie , Meteorologie

Published by Patentinhaber: Gottlieb Fecker und Heinrich Boecker inFirma Fecker & Comp. in Wetzlar Patent: Federregulator für die Triebwerke von astronomischen undmeteorologischen Instrumenten Patentiert am:  29.05.1886P-137
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