John Duncan Watson
... that John Duncan Watson was responsible for the construction of the first large-scale percolating filter sewage treatment plant?
... that <b id="mwFLw"><a href="./John_Duncan_Watson" id="mwFL0" rel="mw:WikiLink" title="John Duncan Watson">John Duncan Watson</a></b> was responsible for the construction of the first large-scale <a class="mw-redirect" href="./Percolating_filter" id="mwFL4" rel="mw:WikiLink" title="Percolating filter">percolating filter</a> <a href="./Sewage_treatment" id="mwFL8" rel="mw:WikiLink" title="Sewage treatment">sewage treatment</a> plant?