电传机
7.Then the telegram was replaced by the telex machine, which was followed by the facsimile.
8.When you are sending out a telex, what you type on your machine is typed at the same time on the machine at the other end, so that a printed copy of the telex message is produced simultaneously at both the sending and receiving ends.
9.To interrupt the telephone, teletype or data transmitting through sending a space character.

