March 1995...one of first events:
 

top quark --> bottom quark and W         W+ --> e+ and a neutrino  bottom quark emerges as neutral anti-B meson decay into Jet 4  antitop quark-->an antibottom quark and W-   W- --> anti-up quark (Jet 2or3) and  down quark(Jet 3 or 2)  antibottom quark (neutral B meson) decays into Jet 1  (cannot tell which of Jets 2 and 3 is the anti-up quark & which is the down quark)