Historical Documents - Original Patentschrift - A. Roth in Schwarzau / Czerniec b. Lüben / Lubin i. Schlesien , 1888 , Saatpflug , Agrar !!!

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From Patents to Industry. Paul Héroult and International Patents Strategies, 1886-1889

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Efficient access to Russian patent documents - ScienceDirect

Efficient access to Russian patent documents - ScienceDirect

Venator & Hanstein, Buch- und Graphikauktionen, Köln

Efficient access to Russian patent documents - ScienceDirect

Herbarz 1904

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Patent information in Italy - ScienceDirect

Herbarz 1904