Welsh coal industry
... that during the Industrial Revolution, the Welsh coal industry was at the forefront of the development of new mining technologies?
... that during the <a href="./Industrial_Revolution" id="mwBCY" rel="mw:WikiLink" title="Industrial Revolution">Industrial Revolution</a>, the <b id="mwBCc"><a href="./Coal_industry_in_Wales" id="mwBCg" rel="mw:WikiLink" title="Coal industry in Wales">Welsh coal industry</a></b> was at the forefront of the development of new <a href="./Coal_mining" id="mwBCk" rel="mw:WikiLink" title="Coal mining">mining technologies</a>?