00367nam a2200109Ia 4500008004100000041001200041082002400053100001600077245011700093260003500210300001200245231217s9999    xx            000 0 und d  aEnglish  a621.382  ATK.1  `R'  aAtkinson, J 0aTelephony V.1: General principles and manual exchange systems ( A detailed exposition of the telephone exchange&  c1948bSir Isaac Pitman, London  axii+499