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JF Ptak Science Books Quick Post
I found this very interesting paper calculating device (ca. 1940) on the Imperial War Museum site (here):
I came to the IWM site via the St. Marylebone WWII site and the section on Air Raid Protection because of unearthing this elegant sticker in one of my pamhlets:
Posted by John F. Ptak on May 08, 2013 at 03:36 PM in Information, Quantitative Display of | Permalink
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