Class-4 telephone switch (English Wikipedia)

Analysis of information sources in references of the Wikipedia article "Class-4 telephone switch" in English language version.

refsWebsite

Global rank English rank

low place

low place

1web.archive.org

1^st place

1^st place

1privateline.com

low place

low place

phworld.org

Cuccia, Mark (December 20, 2008). "History of the Number 4 Crossbar (#4XB) Tandem Switch & listing of former #4XB switches". Telephone World. Retrieved August 24, 2010.
"Telephone Switch Timeline". Telephone World. December 20, 2008. Retrieved August 24, 2010.
"Nortel (Northern Telecom) Modern Telephone Systems". Telephone World. December 20, 2008. Retrieved August 24, 2010.

privateline.com

Farley, Tom. "TSPS History". privateline.com. Archived from the original on June 9, 2011. Retrieved August 23, 2010.

web.archive.org

Farley, Tom. "TSPS History". privateline.com. Archived from the original on June 9, 2011. Retrieved August 23, 2010.