There are 139 names which apply to more than one telephone exchange.
The advanced telephone exchange equipment capable of meeting the needs of the system in 1980 and beyond, could not be developed for some time.
They use the telephone exchange a great deal to call eight and 10 digit numbers.
It has an automatic telephone exchange with 500 subscribers and its laundry, with 31 workers, has a machine capable of washing 500 lb.
The fitting of new telephone exchange equipment this summer should prevent any recurrence of such a problem.
The minimum number of subscribers required to justify the establishment of a telephone exchange depends mainly on the estimated expenses.
The delimitation of telephone exchange areas is necessarily determined by plant considerations and it not infrequently results that municipal and telephone boundaries do not coincide.
In 1974–75 there were 1,350,000 new telephone exchange connections and 554,000 disconnections.
