tone variatorshttp://AATesaurus.cultura.gencat.cat/aat/getty_en?tema=31307742enGetty Institute2026-03-30 20:22:49http://AATesaurus.cultura.gencat.cat/aat/getty_enTesaurus d'Art i Arquitecturatext/html Stern variators Stern's tone variator stern variator tone variator variator, tone variators, Stern