ʻO ke kila kūʻokoʻa me ka pale lole kiʻekiʻe a me ka hana hopena maikaʻi, hiki ke ʻoki, kulou, kuʻi, a me nā mea ʻē aʻe, hiki ke lawe ʻia i ka welding, plug welding, bolting a me nā ala ʻē aʻe e hoʻopili ai me nā hale ʻē aʻe, me ka ʻāina i ka wā o ka ke kahua hoʻoponopono , kūpono, hoʻohana nui ʻia i ka metallurgy, ka lanahu, ka sima, ka uila, ke aniani, ka mining, nā mea kūkulu hale, nā pōhaku lepo a me nā ʻoihana ʻē aʻe, ke hoʻohālikelike ʻia me nā mea ʻē aʻe.