Wiktionary
theatrophone
n. (alternative spelling of théâtrophone English)
Wikipedia
Théâtrophone
Théâtrophone ("the theatre phone") was a telephonic distribution system available in portions of Europe that allowed the subscribers to listen to opera and theatre performances over the telephone lines. The théâtrophone evolved from a Clément Ader invention, which was first demonstrated in 1881, in Paris. Subsequently, in 1890, the invention was commercialized by Compagnie du Théâtrophone, which continued to operate till 1932.