Ring Amplifier #2B, from the year 2002


 Ring Amplifier #2B, from the year 2002, 2


 Ring Amplifier #2B, from the year 2002, 3


 Ring Amplifier #2B, from the year 2002, 4


T:  picture 1, left

"0" = Phone line free
"1" = Phone line busy
"R" = Ring signal


T:  picture 4, left

The set of sound volume
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