Michiel 2005's photos with the keyword: N.V. Idzerda Radio

Corona-Phon, already version 2.1.2 Window and room antenna. Idzerda was a radio pioneer, founding one of the first radio stations and the first commercial radio station. For more info on Idzerda: Wikipedia – PCGG And in Dutch: Inst. Nederlandse Geschiedenis – Idzerda Wikipedia – Idzerda From the book Radio voor amateurs of 1926. Originally an English book by Michael Egan, translated/reworked into Dutch by ir. W. Harmsen.