… treatment of materials by a process involving a change of temperature such as heating, cooking, roasting, distilling, …
Explanatory notes
… treatment of materials by a process involving a change of temperature such as heating, cooking, roasting, distilling, … . (d) Apparatus for fractional distillation (for example, in the production of heavy water) and for … for isotopic separation, and isotopic exchange apparatus employing the “dual‑temperature” method ( heading 84.01 ). …