Duluth Ship Canal
... that the father of aircraft pioneer William Boeing threatened to block the Duluth Ship Canal by tying a rope across it?
... that the father of aircraft pioneer <a class="mw-redirect" href="./William_Boeing" id="mwC1A" rel="mw:WikiLink" title="William Boeing">William Boeing</a> threatened to block the <b id="mwC1E"><a href="./Duluth_Ship_Canal" id="mwC1I" rel="mw:WikiLink" title="Duluth Ship Canal">Duluth Ship Canal</a></b> by tying a rope across it?