Tallinna-Helsingi vahel telefoniühenduste arvu suurendamine olemasolevate merikaablite kaudu kõrgesagedustelefoneerimise abil : seletuskiri
Technical data
URL: http://www.digar.ee/id/nlib-digar:978645
ViewAvailable at the authorised workplace in the National Library of Estonia, Archival Library of the Estonian Literary Museum, Tallinn University of Technology Library, University of Tartu Library and Academic Library of Tallinn University
Available in the network of the National Library of Estonia
Access restricted in public network
URL: http://www.digar.ee/id/nlib-digar:978645
