In order to check the system aspects of the forward-backward MSGC tracker d
esigned for the future CMS experiment at LHC: 38 trapezoidal MSGC counters
assembled in six multi-substrates detector modules were built and exposed t
o a muon beam at the CERN SPS. Results on the gain uniformity along the wed
ge-shaped strip pattern and across the detector modules are shown together
with measurements of the detection efficiency and the spatial resolution. (
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