Some Comments on Heavy Fermions and Leptoquarks

It is pointed out that if heavy $\left[O\right(\mathrm{TeV}\left)\right]$ fermion generations exist and if the source of their masses is the single doublet of the Glashow-Weinberg-Salam model {with a light $[<~O(\frac{1}{2}\mathrm{TeV}\left)\right]$ physical Higgs} then very tightly bound exotic $\mathrm{LQ}$, $L\overline{Q}$, $\mathrm{QQ}$, $\mathrm{LL}$, etc., states may arise marking a dramatic appearance of new physics. In passing there is recalled the phenomenological observation that a discovery of a top quark via its semileptonic decay will practically exclude charged Higgs particles in the mass range $m_t-m_b>~m_{H^{+}}$.