For what does the world owe Almon Strowger a debt of gratitude?
Automatic Telephone Exchanges
An automatic telephone exchange is a centralized place from where all telephone connections are connected to each other indirectly. It has a number of electromechanical switches in it that are controlled by dialled pulses. An exchange will always be situated at the center of a population.
An automatic Strowger telephone exchange, there can be two types of answering methods -
(1) Pre-selection and
(2) Line finding.