• Inventory number: 18286
  
• Language: en
  
• Type: b
  
• Call number: 621.3857
  
• Author number: h886
  
• Title: the director system of automatic telephony
  
• Author: hudson,w.e.
  
• Place of publication and publisher: london:sir isaac pitman and sons,ltd.
  
• Publication date: 1927
  
• Pages: 157+10
  
• Notes: includes illustrations index158
  
• Subject: automatic and semiaufomatic switch board systems
  
• Number of copies: 01
  

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