Ingeniør Valdemar Poulsen paa sin station for traadløs telegrafi i Lyngby og i sit laboratorium
Anker Kirkeby
Valdemar Poulsen at his station for wireless telegraphing in Lyngby.
Engineer Valdemar Poulsen at His Station For Wireless Telegraphy in Lyngby and in his Laboratory
3.1 ⚠️ 1913 