digital data switching group
data transfer interface unit
automatic data pr interface unit
automatic data pr interface unit
data transfer interface unit
automatic data pr interface unit
data transfer interface unit
data transfer interface unit
data transfer interface unit
data transfer interface unit
automatic data pr interface unit
data transfer interface unit
data transfer interface unit
data transfer interface unit
communications switching set
data transfer interface unit
data transfer interface unit
data transfer interface unit
data transfer interface unit
data transfer interface unit
data transfer interface unit
data transfer interface unit
data transfer interface unit
data transfer interface unit
automatic data pr interface unit
data transfer interface unit
data transfer interface unit
communications switching set
