The British Post Office adopted the Baudot system in 1897 for a simplex circuit between London and Paris.
2.
The British Post Office adopted it for a simplex circuit between London and Paris during 1897, then used it for more general purposes from 1898.
3.
The British Post Office adopted the Baudot system for use on a simplex circuit between London and Paris in 1897, and subsequently made considerable use of duplex Baudot systems on their Inland Telegraph Services.
4.
A pair of walkie-talkie two-way radios provide a simplex circuit in the ITU sense; only one party at a time can talk, while the other listens until it can hear an opportunity to transmit.
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