Keywords: 4prongplug.JPG Telephone plug as used in Bell System phones from mid 1960s to mid 1970s on a line cord having a five pin flat plug at the phone end as used at that time on Trimline desk phones According to EXIF data 2008-02-24 own user Jim henderson Jim henderson Original upload log en wikipedia Sreejithk2000 CommonsHelper page en wikipedia 4prongplug JPG 2008-03-04 19 53 Jim henderson 1052×1024× 167056 bytes <nowiki>Four prong standard Telephone plug as used in Bell System phones from late 1960s to mid 1970s on a line cord from the early 1970s having a five pin flat plug at the phone end as used at that time</nowiki> Telephone plugs Western Electric |