Robert Grace
... that Robert Grace was the first manufacturer of the Pennsylvania fireplace, designed by Benjamin Franklin, which heated rooms more efficiently than an open fireplace?
... that <b id="mwAi4"><a href="./Robert_Grace" id="mwAi8" rel="mw:WikiLink" title="Robert Grace">Robert Grace</a></b> was the first manufacturer of the <a href="./Franklin_stove" id="mwAjA" rel="mw:WikiLink" title="Franklin stove">Pennsylvania fireplace</a>, designed by <a href="./Benjamin_Franklin" id="mwAjE" rel="mw:WikiLink" title="Benjamin Franklin">Benjamin Franklin</a>, which heated rooms more efficiently than an open fireplace?