▁- ▁Del iver ed ▁and ▁installed ▁fi ber ▁opt ic ▁L AN ▁systems ▁for ▁the ▁first ▁time ▁in ▁its ▁history ▁▁ 1 9 8 2 ▁- ▁S uc ceed ed ▁in ▁producing ▁the ▁world ' s - larg est - class ▁( 1 . 2 ▁car ats ) ▁synth etic ▁diam onds ▁▁ 1 9 9 6 ▁- ▁Develop ed ▁a ▁technology ▁for ▁producing ▁long - length ▁ox ide ▁high ▁voltage ▁super con duct ing ▁w ires ▁▁ 1 9 9 8 ▁- ▁Develop ed ▁and ▁started ▁market ing ▁e col ogy ▁w ires ▁and ▁c ables ▁▁ 1 9 9 9 ▁- ▁Sum it omo ▁Electric ▁Fine ▁Pol ym er , ▁Inc . ▁( f ine ▁polym er ▁products ) ▁started ▁operation ▁▁ 2 0 0 1 ▁to ▁present ▁▁ 2 0 0 1 ▁- ▁J - Power ▁Systems ▁Corporation ▁( high - vol t age ▁power ▁c ables ) ▁started ▁oper ational ▁▁ 2 0 0 2 ▁- ▁Sum it omo ▁Electric ▁Network s , ▁Inc . ▁( network ▁equipment ), ▁Sum it omo ▁( SE I ) ▁Ste el ▁W ire ▁Cor p . ▁( special ▁steel ▁w ires ) ▁and ▁Sum it omo ▁Electric ▁W inte c , In c . ▁( mag net ▁w ires ) ▁started ▁operation ▁▁ 2 0 0 3 ▁- ▁Sum iden ▁Hit achi ▁C able ▁Ltd . ▁( w ires ▁and ▁c ables ▁for ▁buildings ▁and ▁industrial ▁equipment ) ▁and ▁Sum it omo ▁Electric ▁Hard met al ▁Cor p . ▁( pow der