included many related variations and special purpose models with additional features. This included sets with a headset jack, 2-line sets, keysets (2560), call directors, panel phones (2750), industrial phones (2520), automatic dialers (2660). See also Model 5302 telephone References External links http://www.porticus.org/bell/telephones-500.html Western Electric Model 500 http://www.arctos.com/dial/ Western Electric Telephone Models https://web.archive.org/web/20090530000805/http://www.cortelco.com/pdf/2008SolGuide.pdf Telephony equipment Western Electric telephones