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- 49021472 contributor B1161488.
- 49021472 created "[1949]".
- 49021472 date "1949".
- 49021472 date "[1949]".
- 49021472 dateCopyrighted "[1949]".
- 49021472 description "Includes bibliographies.".
- 49021472 extent "339 p.".
- 49021472 issued "1949".
- 49021472 issued "[1949]".
- 49021472 language "eng".
- 49021472 publisher "London, E. Benn".
- 49021472 subject "621.38775".
- 49021472 subject "TK6397 .B4 1949".
- 49021472 subject "Telephone, Automatic.".
- 49021472 title "Traffic and trunking principles in automatic telephony.".
- 49021472 type "text".