▁succeeded ▁in ▁developing ▁and ▁mass - produ cing ▁the ▁world ' s ▁first ▁gal li um ▁nit ride ▁subst ances . ▁Sum it omo ▁Electric ▁also ▁continues ▁to ▁be ▁the ▁leading ▁manufact urer ▁of ▁composite ▁sem icon duct ors ▁( G a As , ▁Ga N , ▁In P ), ▁which ▁are ▁widely ▁used ▁in ▁sem icon duct or ▁las ers , ▁LED s , ▁and ▁mobile ▁tele communic ations ▁devices . ▁ ▁Environment ▁and ▁Energy ▁This ▁division ▁provides ▁electric ▁wire ▁and ▁cable ▁products ▁that ▁under pin ▁stable ▁energy ▁supply . ▁They ▁include ▁co pper ▁wire ▁ro ds ▁from ▁which ▁various ▁types ▁of ▁electric ▁w ires ▁and ▁c ables ▁are ▁made , ▁power ▁c ables ▁that ▁are ▁ind isp ens able ▁for ▁the ▁supply ▁of ▁high - vol t age ▁electric ity , ▁and ▁t rol ley ▁w ires ▁for ▁rail ways . ▁This ▁business ▁segment ▁also ▁supplies ▁magnet ▁w ires ▁used ▁in ▁household ▁app li ances , ▁autom ot ive ▁electric ▁components , ▁and ▁industrial ▁mot ors - ▁including ▁hy brid ▁products ▁of ▁rub ber , ▁pl astic , ▁and ▁cer am ics ▁resulting ▁from ▁our ▁development ▁of ▁wire ▁co ating ▁techn ologies - ▁to ▁many ▁different ▁branches ▁of ▁industry . ▁ ▁Indust rial ▁Material s ▁Hard ▁metal ▁products , ▁such ▁as ▁cutting ▁tools , ▁are ▁essential ▁for ▁high - speed , ▁high - per formance , ▁and ▁high - prec ision ▁mechanical ▁processing . ▁This ▁division ▁manufact ures ▁products ▁used ▁in ▁many ▁indust ries , ▁including ▁special ▁metal ▁w ires ▁for