An underground search has been made for fractionally charged particles by measuring precisely the d E/d x and the time of flight of the penetrating cosmicray particles with six layers of scintillator hodoscopes. No candidate was found for relativistic particles with charge 2/3 or 1/2, setting upper limits on the flux of 9.8.10-13 and 7.5.10-13cm-2sr-1s-1, respectively.
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