2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/57431A recent complete, explicit classification of all locally constructed symmetries and currents for free spinorial massless spin s fields on Minkowski space is summarized and extended to give a classification of all covariant symmetry operators and conserved tensors. The results, for physically interesting cases, are also presented in tensorial form for electromagnetic and graviton fields (s=1,2) and in Dirac 4-spinor form for neutrino fields (s=1/2).16 pages; To appear in: CRM Proceedings and Lecture Notes, Volume 34 (2003)Mathematical Physics81R20, 70S10; 81R25text