ʻO ka mea hoʻohui ma ka manaʻo maʻamau e pili ana i nā ʻāpana electromechanical e hoʻopili ai i nā conductors (wires) me nā ʻāpana male kūpono e hoʻokō ai i ka pilina o kēia manawa a i ʻole ka hōʻailona a me ka wehe ʻana.Hoʻohana nui ʻia i ka aerospace, kamaʻilio a me ka lawe ʻana i ka ʻikepili, nā kaʻa ikehu hou, ka lawe kaʻaahi, nā mea uila uila, nā lāʻau lapaʻau a me nā ʻano ʻokoʻa ʻē aʻe.
ʻO nā mea hoʻohui pūʻali koa he mea pono ia no ka mokulele reconnaissance, missiles, smart bombs a me nā mea kaua kiʻekiʻe hou, i hoʻohana nui ʻia i ka mokulele, aerospace, nā mea kaua, nā moku, nā uila a me nā ʻenehana kiʻekiʻe.