Lurgi-Ruhrgas process
... that the Lurgi-Ruhrgas process for oil shale extraction was originally developed for the liquefaction of lignite?
... that the <b id="mwFVU"><a class="mw-redirect" href="./Lurgi-Ruhrgas_process" id="mwFVY" rel="mw:WikiLink" title="Lurgi-Ruhrgas process">Lurgi-Ruhrgas process</a></b> for <a class="mw-redirect" href="./Oil_shale_extraction" id="mwFVc" rel="mw:WikiLink" title="Oil shale extraction">oil shale extraction</a> was originally developed for the liquefaction of <a href="./Lignite" id="mwFVg" rel="mw:WikiLink" title="Lignite">lignite</a>?