LAGO TELEPHONE EXCHANGE
The Lago telephone exchange served both the refinery and the Colony. This was a modern dial exchange with mechanical rotary switching. All calls within the Lago Concession could be made by dialing a four digit number. To call outside the Concession you had to call and get a outside line connected to the Island telephone system.
To make a overseas call you had to go to the Main Office Building and book a call and use a phone in the Office. This was very time consuming, expensive and few overseas call were made, people depended on cablegrams.