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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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WARNING: This product can expose you to chemicals including lead and lead compounds, which are known to the State of California to cause cancer and birth defects or other reproductive harm. For more information, visit www.P65Warnings.ca.gov.