▁was ▁therefore ▁started , ▁producing ▁three ▁success ive ▁draft ▁documents . ▁The ▁final ▁draft ▁would ▁have ▁extended ▁O CR - B ▁with ▁ 4 0 ▁Latin ▁and ▁ 1 0 ▁Greek ▁letters ; ▁for ▁six ▁Latin ▁letters , ▁the ▁draft ▁gave ▁new ▁alternate ▁shapes . ▁A ▁request ▁to ▁extend ▁O CR - B ▁with ▁Vietnam ese ▁acc ents ▁was ▁rejected . ▁Other ▁than ▁previous ▁versions ▁of ▁the ▁standard , ▁which ▁specified ▁g lyph ▁shapes ▁via ▁reference ▁draw ings , ▁the ▁new ▁revision ▁would ▁have ▁included ▁the ▁shapes ▁in ▁machine - read able ▁form . ▁However , ▁industry ▁support ▁for ▁testing ▁the ▁new ▁font ▁could ▁not ▁be ▁secured ▁at ▁the ▁time , ▁so ▁the ▁revision ▁effort ▁was ▁halt ed ▁in ▁ 1 9 9 7 . ▁The ▁working ▁group ▁described ▁their ▁find ings ▁in ▁a ▁technical ▁report . ▁▁ ▁In ▁June ▁ 1 9 9 8 , ▁the ▁European ▁Committee ▁for ▁Standard ization ▁published ▁a ▁report ▁for ▁adding ▁the ▁Euro ▁sign ▁to ▁O CR - B . ▁The ▁report ▁proposed ▁both ▁a ▁single - st rok ed ▁and ▁a ▁double - st rok ed ▁variant ▁of ▁the ▁Euro ▁sign , ▁leaving ▁the ▁decision ▁to ▁further ▁testing ▁of ▁O CR ▁performance . ▁Test ing ▁was ▁difficult : ▁the ▁theoretical ▁design ▁methods ▁used ▁when ▁the ▁O CR - B ▁g lyph s ▁were ▁originally ▁developed ▁could ▁no ▁longer ▁be ▁reprodu ced , ▁and ▁the ▁techn ological ▁constraints ▁of ▁the ▁ 1 9 6 0 s ▁were ▁also ▁not ▁entirely ▁relevant ▁anymore ▁in ▁the ▁O CR ▁environments