Unblinking Eye
1892 Brauswetter patent drawing

Brauswetter Patent Drawing.  This drawing is from Swiss patent 5030, dated 20 April 1892, issued to Otto Brauswetter and Aktiengesellschaft Eisenwerke Gaggenau.  Rights to it must have been assigned to Theodor Bergmann, because his patent of 1893 is clearly based on it. 



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