Oki Electric Industry Co is going into mass-production of hand-held cellular telephones at its Atlanta, Gerogia plant, which up to now has specialised in cArRtelephones and over-the-shoulder luggable phones, but began assembling the briefcase phones from kits in the spring: monthly production will initially be at around 1,500 to 1,600 a month, growing to 3,000 units by year-end, and if demand warrants it, going to 6,000 to 7,000 a month from April next year; its plant in Japan has been producing special units mainly for supply direct to automobile manufacturers, but is now planning to concentrate on supply to communications equipment vendors such as Japan Mobile Communications and the new independent Japanese telecommunications firms.