History of mobile phones
A cellular telephone switching plan was described by Fluhr and Nussbaum in 1973, and a cellular telephone data signaling system was described in 1977 by Hachenburg et al.
Celesta
The celesta was invented in 1886 by the Parisian harmonium builder Auguste Mustel. His father, Victor Mustel, had developed the forerunner of the celesta, the typophone, in 1860. This instrument produced sound by striking tuning forks instead of the metal plates that would be used in the celesta. The dulcitone functioned identically to the typophone and was developed concurrently in Scotland; it is unclear whether their creators were aware of one another's instrument. The typophone/dulcitone's uses were limited by its low volume, too quiet to be heard in a full orchestra.