Internal-symmetry gauge bosons and the tetrad fields of gravity with their respective nontrivial local transformation behaviour are constructed by more basic gauge fermions. A physically sensible mass scale Λ2 for a parametrization for the small-distance behaviour of the theory is closely related to Newton’s and Sommerfeld’s constants. Local invariances determine uniquely the renormalizable gauge fermion self-interactions. The very quantization can be interpreted as a dynamical breakdown of a local spin rotation invariance and leads to spin-spin four-fennion interaction in a dynamical Higgs mechanism.