liquid thermal diffusion plant
... that the Manhattan Project's liquid thermal diffusion plant was the only production-scale plant of its kind ever built?
... that the <a href="./Manhattan_Project" id="mwBxk" rel="mw:WikiLink" title="Manhattan Project">Manhattan Project</a>'s <b id="mwBxo"><a href="./S-50_(Manhattan_Project)" id="mwBxs" rel="mw:WikiLink" title="S-50 (Manhattan Project)">liquid thermal diffusion plant</a></b> was the only production-scale plant of its kind ever built?