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Historical German Patents & Torsion Pendulum Clocks

34404
This compendium of German DRP patents is the work of Doug Stevenson who made a number of outstanding contributions to the discovery of new information concerning makers & production of torsion-pendulum clocks. 28 DRP patents are reproduced in their entirety with many pictures of the items to be patented. The Timely Memories book (#34400) is dedicated to Doug’s memory. 120 pages.
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