second U.S. Patent Office fire
... that despite the devastation of the second U.S. Patent Office fire , in a supposedly fireproof building, not one patent was lost?
... that despite the devastation of the <b id="mwDnM"><a class="mw-redirect" href="./1877_U._S._Patent_Office_fire" id="mwDnQ" rel="mw:WikiLink" title="1877 U. S. Patent Office fire">second U.S. Patent Office fire</a></b> <i id="mwDnU">(pictured)</i>, in a supposedly fireproof building, not one patent was lost?