Patent-nachrichten : patent listings in the Deutsche Uhrmacher-Zeitung 1877-1932 /

Patent-nachrichten : patent listings in the Deutsche Uhrmacher-Zeitung 1877-1932 / D.K. Stevenson. - 2 volumes : illustrations ; 30 cm

Bd. 1. 1877-1909 -- Band 2. 1910-1932.


Clocks and watches--Patents--Germany--19th century.
Clocks and watches--Patents--Germany--20th century.

Timekeeper (general) Germany Ruhrei patent Stevenson, Douglas K. NA/Other