Early telephone constructed by Alexander Graham Bell in 1877 and having a single unit which was both speaker and receiver. Bell filed a patent on the telephone on 14th February,1876,but his priority as absolute inventor was questioned by Elisha Gray of Western Electric who similarly filed a patent on the same day. After long litigation,Bell won "the most valuable patent ever issued in the US" | |
Lizenzart: | Lizenzpflichtig |
Credit: | Science Photo Library / Charmet, Jean-Loup |
Bildgröße: | 3328 px × 2557 px |
Modell-Rechte: | nicht erforderlich |
Eigentums-Rechte: | nicht erforderlich |
Restrictions: | - |