TDS1 Single line Dialup system. Automatic answer and manual hold facilities. Remote indicator and remote start switching. ....more
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TDS1SR Single line Dialup system. Automatic answer and manual hold facilities with remote indicator and remote start switching. Can either send or receive audio under switched control....more
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TDS2 Double line Dialup system. As TDS1 but with two completely independant and isolated circuits. ....more
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