Hi gang,
  There are 2 Sprengnether units for auction on ebay:
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Seismograph recording station  Item number: 3039349911   
Ends Aug. 13
This looks like a v. nice unit.
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Sprengnether Chart Recorder (seismograph)  Item number: 2550163621   
Ends Aug. 13
This looks like a 3-channel strip chart recorder.
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   I search ebay with   seismo*
This gets only a small amount of junk.
Bob Barns
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