History left|thumb|340x340px|Telegraphic multiplexer, from 1922 Britannica Time-division multiplexing was first developed for applications in telegraphy to route multiple transmissions simultaneously over a single transmission line. In the 1870s, Émile Baudot developed a time-multiplexing system of multiple Hughes telegraph machines.
history lEFt|thumB|340x340Px|TeLegRaPhic MuLtiPleXEr, frOM 1922 BritAnnICa tIme-DiVision multiplexINg WAS fIrst deveLOPed for appliCations iN telegRAPhY To route mulTipLe tRansMisSIons simULtaneOusly oveR A sInGle transMiSsion liNe. in thE 1870s, éMilE baudot dEveLOped A time-MuLTipleXing sYsteM of multiPLe hughEs TElEgRaph machinEs.