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1.
Historical German patents & torsion pendulum clocks. part I, DRPS 1877-1945 / D.K. Stevenson. by
Material type: Text Text; Format: print ; Literary form: Not fiction
Publisher: Essen, Germany : Ruhrei Verlag, [2002]
Other title:
  • Historical German patents and torsion pendulum clocks.
Availability: Items available for loan: Jost Bürgi Library (1)Call number: TS543.G3 S84 2002.
2.
Patent-nachrichten : patent listings in the Deutsche Uhrmacher-Zeitung 1877-1932 / D.K. Stevenson. by
Material type: Text Text; Format: print ; Literary form: Not fiction
Publisher: Essen, Germany : Ruhrei Verlag, 2003
Availability: Items available for loan: Jost Bürgi Library (2)Call number: TS543.G3 P38 2003 Bd.1, ...
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