Historical Documents - Original Patentschrift - A. Roth in Schwarzau / Czerniec b. Lüben / Lubin i. Schlesien , 1888 , Saatpflug , Agrar !!!

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Siebmacher 1701

Anhang SpringerLink

Herbarz 1904

Auszüge aus den Patentschriften 1884. by Patente, Erfindungen - Kaiserliches Patentamt (Hrsg.)

Siebmacher 1701

Herbarz 1904

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

Herbarz 1904

Efficient access to Russian patent documents - ScienceDirect

Annual Report of the Commissioner of Patents - United States. Patent Office - Google Bøger

Efficient access to Russian patent documents - ScienceDirect

Frisch, Johann Leonhard - Public domain portrait engraving - PICRYL - Public Domain Media Search Engine Public Domain Search

Historical Documents - Original Patentschrift - A. Roth in Schwarzau / Czerniec b. Lüben / Lubin i. Schlesien , 1888 , Saatpflug , Agrar !!!