Editing Twistor memory (section)

==Applications==
Twistor was used in a number of applications. Much of the development funding was supplied by the [[US Air Force]], as twistor was to be used as the main memory in the [[LIM-49 Nike Zeus]] project.

In the United States the [[Bell System]] ([[American Telephone & Telegraph]]) also used twistors with permanent magnets as the "Program Store" or main memory in their first electronic telephone switching system, the [[1ESS switch|1ESS]] as well as others in the [[Electronic switching system|ESS]] series of electronic [[telephone switch]]es, and did so up to the [[4ESS switch]] introduced in 1976 and sold into the 1980s.

In addition, twistor was used in the [[Traffic Service Position System]] (TSPS), Bell's successor to cord [[telephone switchboard]]s which controlled call handling and coin collection for local and international calls.

By 2017 all remaining TSPS and ESS installations used to provide telephone service in rural areas of the United States had been removed. Some systems may remain in use [[Communications in Mexico|Mexico]] and [[Communications in Colombia|Colombia]], where many U.S. systems were sold and re-installed after being removed from service in the United States.{{Citation needed|date=July 2022}}