|  | F |
SECTION F — MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING

LIGHTING AND HEATING

|  | F27 |
FURNACES; KILNS; OVENS; RETORTS (specially adapted for a purpose covered by a single other class and specifically mentioned per se in that class, see the class in question, e.g. bakery ovens Fulltext... Hierarchy... Expanded...A21B, coke or gas-making apparatus Fulltext... Hierarchy... Expanded...C10B, Fulltext... Hierarchy... Expanded...C10J, apparatus for craking hydrocarbons Fulltext... Hierarchy... Expanded...C10G, blast furnaces Fulltext... Hierarchy... Expanded...C21B, Bessemer converters for making steel Fulltext... Hierarchy... Expanded...C21C, furnaces for heat treatment of metal Fulltext... Hierarchy... Expanded...C21D, enamelling ovens Fulltext... Hierarchy... Expanded...C23D, combustion apparatus Fulltext... Hierarchy... Expanded...F23, electric heating Fulltext... Hierarchy... Expanded...H05B)

|  | F27 |
Note(s) This class deals with furnaces, kilns, ovens, retorts, open sintering apparatus, and details or accessories therefor, in general. It includes the arrangement of electrical heating elements in or on furnaces, but not the elements themselves. It is not concerned with the processes carried on within the furnaces. In this class, where appropriate, the term "furnaces" is to be understood as covering kilns, ovens, or retorts.

|  | F27B |
FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS

|  | F27B |
Note(s) Attention is drawn to the references and notes following the title of class Fulltext... Hierarchy... Expanded...F27 and the note (para. III) following the Contents of Section of Section H.

|  | F27D |
DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE (combustion apparatus per se Fulltext... Hierarchy... Expanded...F23)

|  | F27D |
Note(s) Attention is drawn to the references and notes following the title of class Fulltext... Hierarchy... Expanded...F27 and the note (Note III) following the Contents of Section of Section H.