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Google圖書搜尋
International Telephone Service Operation
International Telegraph and Telephone Consultative Committee. Plenary Assembly
其他書名
Recommendations E.100-E.323
出版
International Telecommunication Union
, 1900
ISBN
9261020011
9789261020019
URL
http://books.google.com.hk/books?id=UZlvAQAACAAJ&hl=&source=gbs_api