  We investigate the production, signatures and backgrounds of a pair of
heavy-exotic charged leptons and a heavy-exotic neutrino together with the
exotic charged lepton in the framework of the vector singlet model, vector
doublet model, and fermion-mirror-fermion model, at the CERN Large Hadron
Collider (LHC). We still show that the cross-sections for the case of the
production of a pair of heavy exotic leptons are competitive with the ones for
the single production of exotic leptons.
