The most important telephone fact is .......that a telephone is used to call people and secondly the telephone saves time by letting people talk with important businesses.
transmitter
maybe the transmiter
kjokoiip'l
telephone and electricity
the telephone
oxygen is most important use is for breathing
the telephone
He is known for inventing the telephone.
A key fact is just a very important fact. More important than most of the other facts.
It is very greasy
telephone computer tv freezer
trosposphere is the most important layer in the atmosphere