Related terms:
caveat
bell
tivadar
edison
us patent
patent
elisha gray
carbon
bell labs
switchboard
telephony
philipp reis
telegraph
diaphragm
cellular
impedance
invention
antonio meucci
receiver
microphone
transmitting
telephone
patent office
thomas edison
transmitter
long distance
telephone exchange
alexander graham bell
electromagnetic
invention of the telephone
Wikipedia sources:
Microphone
Amplifier
History of the telephone
Thomas Edison
Timeline of the telephone
Invention of the telephone
Context for words:
carbon
microphone
|
|