R. J. Mitchell
... that R. J. Mitchell was the lead designer of the Supermarine Spitfire?
... that <b id="mwAvk"><a href="./R._J._Mitchell" id="mwAvo" rel="mw:WikiLink" title="R. J. Mitchell">R.<span id="mwAvs" typeof="mw:Entity"> </span>J. Mitchell</a></b> was the lead designer of the <a href="./Supermarine_Spitfire" id="mwAvw" rel="mw:WikiLink" title="Supermarine Spitfire">Supermarine Spitfire</a>?