development of cellular networks
development of computer music
development of digital communications
development of digital transmission
development of error-correcting codes
development of fiber optics
development of satellite communications
development of speech synthesis
development of touch-tone dialing
invention of the transistor
development of information theory
development of digital signal processor
development of solar cell
development of the laser
discovery of cosmic microwave background radiation
invention of C programming language
invention of UNIX operating system
invention of the charge-coupled device (CCD)
invention of the telephone switch