​Original old telecom vintage magazine ad for the BELL SYSTEM. New generation of PBX's for your business office telephone.  Private Branch Exchange neatly housed in compact cabinets.  They can handle up to 2000 phones.  In addition to basic services as interoffice dialing, each PBX offers many options.  Like station add-on, attendant camp-on.
​This 1973 unique old one page communications equipment trade advertisement would display beautifully matted and framed.