Mushet steel
... that Mushet steel was the first tool steel and later led to the discovery of high speed steel?
... that <b id="mwFuY"><a href="./Mushet_steel" id="mwFuc" rel="mw:WikiLink" title="Mushet steel">Mushet steel</a></b> was the first <a href="./Tool_steel" id="mwFug" rel="mw:WikiLink" title="Tool steel">tool steel</a> and later led to the discovery of <a class="mw-redirect" href="./High_speed_steel" id="mwFuk" rel="mw:WikiLink" title="High speed steel">high speed steel</a>?