Search Results for: Communication apparatus
july , u.s. patent improvement in electric telegraph for transmitting musical tones, issued july , u.s. patent automatic circuit-breakers for electro-harmonic telegraphs, filed jan , , issued feb , u.s. patent electro-harmonic telegraph, filed jan , , issued feb , u.s. patent telephonic telegraph apparatus
, filed jan , , issued april , u.s. patent electro-harmonic telegraph, filed jan , , issued jan , u.s. patent art of telegraphy, issued july (writing telegraph or telautograph) u.s. patent telautograph, issued july u.s. patent telautograph, issued october u.s. patent art of and apparatus for telautographic...
https://en.wikipedia.org/wiki/Elisha_Gray