Wooden radio. A 1931 Philips 930A Dutch-made radio with wooden casing. Wireless telegraphy,the principle upon which radios operate,was developed by Guglielmo Marconi from 1895. The first portable radio receiver was invented in 1922 | |
Lizenzart: | Lizenzpflichtig |
Credit: | Science Photo Library / Sauze, Francoise |
Bildgröße: | 3635 px × 2480 px |
Modell-Rechte: | nicht erforderlich |
Eigentums-Rechte: | nicht erforderlich |
Restrictions: | - |