The telephone operators operated the transmission lines manually; their role was to switch between one line and another to make communication between sender and receiver possible. To work as a telephone operator, women had to be between 18 and 27 years old, not have visual problems that required glasses, be single and be flexible in their arms to be able to stretch their arms up to a minimum of 155 centimeters. The first women to work as telephone operators came out of labor standards, a world that in those years was completely dominated by men.