<i>Title:</i> Patent Office files. Washington, D.C., Feb. 29. Employees in the patent office file room. Approximately 2,180,00 patents are kept on file for public use, 2-29-40
<i>Abstract/medium:</i> 1 negative : glass ; 4 x 5 in. or smaller
Harris &amp; Ewing, photographer
1940
<p>Library of Congress
</p>
<ul><li><i>Catalog:</i> <a rel="nofollow" class="external free" href="https://lccn.loc.gov/2016877282">https://lccn.loc.gov/2016877282</a></li>
<li><i>Image download:</i> <a rel="nofollow" class="external free" href="https://cdn.loc.gov/service/pnp/hec/28300/28336v.jpg">https://cdn.loc.gov/service/pnp/hec/28300/28336v.jpg</a></li>
<li><i>Original url:</i> <a rel="nofollow" class="external free" href="https://www.loc.gov/pictures/item/2016877282/">https://www.loc.gov/pictures/item/2016877282/</a></li></ul>