Assertion: ore's iron | /r/HasProperty | the pick or axe blade
Facets:
Source sentences:
text: During this time, carbon diffused into the surface layers of the iron, producing cement steel or blister steel—also known as case hardened, where the portions wrapped in iron (the pick or axe blade) became harder, than say an axe hammer-head or shaft socket which might be insulated by clay to keep them from the carbon source.