Pièce
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1913 - 1913 (Aufsatz geschrieben Herbst 1913, S. 207, unten links)
Fait partie de Post and Telecommunications Museum Foundation
Motif 1 (p.207): 'Radio section with 'Balloon low' on the march', motif 2 (p.207): 'Reception desk and transmitter switchboard of the Dares telephone station;nThurn, H. [author];n'Wireless telegraphy.'; p.207 'Radio department with 'Balloon low' on the march.'; p. 207 'Reception desk and transmitter switchboard of the Dar es Salaam telephone station.'; p. 207 'General view of the Salonika telephone station.'; p. 208