Pfitzner Flyer
... that the Pfitzner Flyer, the first monoplane built and flown in the US, used telescopic wing-tips to avoid infringement of the Wright brothers' wing warping patents?
... that the <b id="mwBWM"><a href="./Pfitzner_Flyer" id="mwBWQ" rel="mw:WikiLink" title="Pfitzner Flyer">Pfitzner Flyer</a></b>, the first <a href="./Monoplane" id="mwBWU" rel="mw:WikiLink" title="Monoplane">monoplane</a> built and flown in the US, used telescopic wing-tips to avoid infringement of the <a class="mw-redirect" href="./Wright_Brothers" id="mwBWY" rel="mw:WikiLink" title="Wright Brothers">Wright brothers'</a> <a href="./Wing_warping" id="mwBWc" rel="mw:WikiLink" title="Wing warping">wing warping</a> patents?