Sikorsky S-64 Skycrane helicopter "Olga" placing a segment of upper section of Toronto's CN Tower during construction, March 1975. (Digitized from original Kodachrome.)
<a href="//commons.wikimedia.org/wiki/User:WikiPedant" title="User:WikiPedant">WikiPedant</a>
<span class="int-own-work" lang="en">Own work</span>