| | Thanks
to improvements introduced by French Ader allows 881 from the spread of
'THEATROPHONE' first form of cultural diffusion, the spread of this
service will continue until the advent of commercial radio 1932.
service promoted by the company of "THEATROPHONE" was
transmitted in stereo (two channels phone) works, and other comedies by
various theaters of the Paris
Chafe, hotel lobby or even at home. In 1891 the service has