The <a href="https://en.wikipedia.org/wiki/Old_Patent_Office_Building" id="mwbw" rel="mw:WikiLink" title="Old Patent Office Building">U.S. Patent Office</a> building in Washington, D.C., nearly <a href="https://en.wikipedia.org/wiki/1836_U.S._Patent_Office_fire" id="mwcA" rel="mw:WikiLink" title="1836 U.S. Patent Office fire">burns to the ground</a>, destroying all 9,957 patents issued by the federal government to that date, as well as 7,000 related <a href="https://en.wikipedia.org/wiki/Patent_model" id="mwcQ" rel="mw:WikiLink" title="Patent model">patent models</a>.<sup about="#mwt46" class="mw-ref reference" data-mw='{"name":"ref","attrs":{},"body":{"id":"mw-reference-text-cite_note-7"}}' id="cite_ref-7" rel="dc:references" typeof="mw:Extension/ref"><a href="./December_15#cite_note-7" id="mwcg" style="counter-reset: mw-Ref 7;"><span class="mw-reflink-text" id="mwcw">[7]</span></a></sup>
<span class="mw-reference-text" id="mw-reference-text-cite_note-7"><cite about="#mwt43" class="citation book cs1" id="CITEREFNiemann2006">Niemann, Paul (2006). <a class="external text" href="https://books.google.com/books?id=tx9Zkz0XqA4C&amp;q=%22In%201877%22" id="mwBow" rel="mw:ExtLink nofollow"><i id="mwBo0">More Invention Mysteries</i></a>. Quincy, Ill.: Horsefeathers Publishing Company. p.<span id="mwBo4" typeof="mw:Entity"> </span>130. <a class="mw-redirect" href="./ISBN_(identifier)" id="mwBo8" rel="mw:WikiLink" title="ISBN (identifier)">ISBN</a><span id="mwBpA" typeof="mw:Entity"> </span><a href="./Special:BookSources/9780974804118" id="mwBpE" rel="mw:WikiLink" title="Special:BookSources/9780974804118"><bdi id="mwBpI">9780974804118</bdi></a>.</cite><span about="#mwt43" class="Z3988" id="mwBpM" title="ctx_ver=Z39.88-2004&amp;rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&amp;rft.genre=book&amp;rft.btitle=More+Invention+Mysteries&amp;rft.place=Quincy%2C+Ill.&amp;rft.pages=130&amp;rft.pub=Horsefeathers+Publishing+Company&amp;rft.date=2006&amp;rft.isbn=9780974804118&amp;rft.aulast=Niemann&amp;rft.aufirst=Paul&amp;rft_id=https%3A%2F%2Fbooks.google.com%2Fbooks%3Fid%3Dtx9Zkz0XqA4C%26q%3D%2522In%25201877%2522&amp;rfr_id=info%3Asid%2Fen.wikipedia.org%3ADecember+15"></span></span>