digital data switching group
automatic data pr interface unit
automatic data pr interface unit
automatic data pr interface unit
automatic data pr interface unit
automatic data pr interface unit
digital data switching group
digital data switching group
automatic data pr interface unit
communication gateway processor
automatic data pr interface unit
automatic data pr interface unit
automatic data pr interface unit
automatic data pr interface unit
automatic data pr interface unit
digital data switching group
automatic data processing server
automatic data processing server
digital data switching group
automatic data pr interface unit
automatic data pr interface unit
communications switching set
digital data switching group