  We show that in a large class of supersymmetric $SU(2)_L\times SU(2)_R\times
SU(4)_c$ models with the see-saw mechanism for neutrino masses and an R-parity
conserving vacuum, there are diquark Higgs bosons with masses ($M_{qq}$) near
the weak scale even though the scale of $SU(2)_R\times SU(4)_c$ symmetry
breaking is around $10^{10}$ GeV. This happens because these masses ($M_{qq}$)
arise out of higher dimensional operators needed to stabilize the charge
conserving vacuum in the model. This feature has the interesting implication
that the $\Delta B=2$ processes such as neutron-anti-neutron oscillation can
have observable rates while at the same time yielding neutrino masses in the
range of current interest.
