▁ 1 9 3 0 s . ▁The ▁National ▁Television ▁Systems ▁Committee ▁( NT SC ) ▁standard ized ▁on ▁a ▁ 5 2 5 - line ▁broadcast ▁in ▁ 1 9 4 1 ▁that ▁would ▁provide ▁the ▁basis ▁for ▁television ▁across ▁the ▁country ▁through ▁the ▁end ▁of ▁the ▁century . ▁ ▁Television ▁development ▁halt ed ▁with ▁the ▁on set ▁of ▁World ▁War ▁II , ▁but ▁a ▁few ▁pione er ▁stations ▁remained ▁on ▁the ▁air ▁throughout ▁the ▁war , ▁primarily ▁W NB T , ▁W CB W ▁and ▁W AB D ▁( the ▁former ▁W 2 X W V , ▁which ▁became ▁commer cially ▁lic ensed ▁in ▁ 1 9 4 4 , ▁owned ▁by ▁the ▁Du Mont ▁Television ▁Network , ▁now ▁W N Y W ) ▁in ▁New ▁York ▁City , ▁W RGB ▁in ▁Sch en ect ady , ▁New ▁York ▁( owned ▁by ▁General ▁Electric ), ▁W PT Z ▁( now ▁K Y W - TV ) ▁in ▁Philadelphia ▁( owned ▁by ▁Phil co ), ▁W 9 X B K ▁( now ▁W BB M - TV ) ▁in ▁Chicago , ▁as ▁well ▁as ▁W 6 X A O ▁( now ▁K C BS - TV ) ▁and ▁W 6 XY Z ▁( now ▁K T LA ) ▁in ▁Los ▁Angeles . ▁When ▁that ▁conflict ▁ended , ▁these ▁stations ▁expanded ▁their ▁broadcast ▁sched ules ▁and ▁many ▁other ▁organizations ▁applied ▁for ▁television ▁station ▁lic enses . ▁ ▁After ▁a ▁flo od ▁of ▁television ▁license ▁applications , ▁the ▁F CC ▁fro ze ▁the ▁application