<i>Title:</i> Pill-Box Fort built in four hours. Washington, D.C., Aug. 25. Something new in speedy-built forts was built on the grounds of the Bureau of Standards today in four hours. Karl P. Billner, Swedish Inventor, supervised the building of the pill box which was done by his new invention as the vacuum concrete invention. Today's demonstration was to show a new and more efficient method of construction for defense purposes under emergencies, 8/25/38
<i>Abstract/medium:</i> 1 negative : glass ; 4 x 5 in. or smaller
Harris &amp; Ewing, photographer
1938
<p>Library of Congress
</p>
<ul><li><i>Catalog:</i> <a rel="nofollow" class="external free" href="https://lccn.loc.gov/2016873975">https://lccn.loc.gov/2016873975</a></li>
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<li><i>Original url:</i> <a rel="nofollow" class="external free" href="https://www.loc.gov/pictures/item/2016873975/">https://www.loc.gov/pictures/item/2016873975/</a></li></ul>