scientific and laboratory apparatus; namely, thin layer evaporators, stills and gasifiers with internal condensors for distillation, degasification, stripping, demonomerization, and concentration

SCIENTIFIC AND LABORATORY APPARATUS, NAMELY, THIN LAYER EVAPORATORS, STILLS AND GASIFIERS WITH INTERNAL CONDENSORS FOR DISTILLATION, DEGASIFICATION, STRIPPING, DEMONOMERIZATION, AND CONCENTRATION, ESPECIALLY IN VACUO