Imperial Towers
...that the six Imperial Towers were the first Canadian lighthouses to be fitted with Fresnel lenses?
...that the six <b id="mwBSU"><a href="./Imperial_Towers" id="mwBSY" rel="mw:WikiLink" title="Imperial Towers">Imperial Towers</a></b> were the first <a href="./Canada" id="mwBSc" rel="mw:WikiLink" title="Canada">Canadian</a> <a href="./Lighthouse" id="mwBSg" rel="mw:WikiLink" title="Lighthouse">lighthouses</a> to be fitted with <a href="./Fresnel_lens" id="mwBSk" rel="mw:WikiLink" title="Fresnel lens">Fresnel lenses</a>?