P.S.   
      
   Here is a customer leaflet describing the numerous features of Bell's   
   electronic Dimension PBX.  It's undated, but I think it's from the late   
   1970s.  I think it was the last PBX offered by Bell before Divestiture, though   
   some advanced key systems were    
   under development and may have been released prior to Divestiture.  Mr.   
   Mukerji may know more.   
      
   I think it's useful in describing the state of the art of telephone service   
   and PBX systems of that era.   
      
   http://www.telephonecollectors.info/index.php/document-repositor   
   /doc_details/309-dimension-electronic-pbx-series-100-400-and-2000   
      
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