PZL.49 Miś
... that almost all documentation of PZL.49 Miś, a development of advanced Polish medium bomber PZL.37 Łoś, was destroyed during the siege of Warsaw to prevent it from falling into Nazi German hands?
... that almost all documentation of <b id="mwAhw"><a href="./PZL.49_Miś" id="mwAh0" rel="mw:WikiLink" title="PZL.49 Miś">PZL.49 Miś</a></b>, a development of advanced Polish medium bomber <a href="./PZL.37_Łoś" id="mwAh4" rel="mw:WikiLink" title="PZL.37 Łoś">PZL.37 Łoś</a>, was destroyed during the <a href="./Siege_of_Warsaw_(1939)" id="mwAh8" rel="mw:WikiLink" title="Siege of Warsaw (1939)">siege of Warsaw</a> to prevent it from falling into <a class="mw-redirect" href="./Nazi_German" id="mwAiA" rel="mw:WikiLink" title="Nazi German">Nazi German</a> hands?