|  | B |
SECTION B — PERFORMING OPERATIONS

SHAPING

|  | B21 |
MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL (casting, powder metallurgy Fulltext... Hierarchy... Expanded...B22; shearing Fulltext... Hierarchy... Expanded...B23D; soldering, welding, flame-cutting Fulltext... Hierarchy... Expanded...B23K; miscellaneous metal-working Fulltext... Hierarchy... Expanded...B23P; punching sheet material in general Fulltext... Hierarchy... Expanded...B26F; processes for changing of physical properties of metals Fulltext... Hierarchy... Expanded...C21D, Fulltext... Hierarchy... Expanded...C22F; electroforming Fulltext... Hierarchy... Expanded...C25D 1/00)

|  | B21 |
Note(s) Combinations of operations covered by different sub-classes are dealt with in Fulltext... Hierarchy... Expanded...B23P. Combinations of operations covered by any particular sub-class with operations covered by other classes, e.g. with operations involving removal of material, are also dealt with in Fulltext... Hierarchy... Expanded...B23P, except that if the operations covered by the other classes are subsidiary to the operations properly covered in a single sub-class of Fulltext... Hierarchy... Expanded...B21 the combination is classified in that sub-class. Processes of a kind covered by this class but applied to non-metallic materials may be classified here if they are applicable to metal and cannot be classified fully in one other class.

|  | B21B |
ROLLING OF METAL (auxiliary operations used in connection with metal-working operations covered in Fulltext... Hierarchy... Expanded...B21, see Fulltext... Hierarchy... Expanded...B21C; bending by rolling Fulltext... Hierarchy... Expanded...B21D; manufacture of particular objects, e.g. screws, wheels, rings, barrels, balls, by rolling Fulltext... Hierarchy... Expanded...B21H; plating Fulltext... Hierarchy... Expanded...B23P 3/06)

|  | B21B |
Note(s) In this sub-class, the term "rolling" is understood to refer to operations in which plastic deformations occur. The term "continuous process" as used in this sub-class means one employing a mill train designed to have the workpiece enter one pair of rolls before leaving the preceding pair.

|  | B21C |
MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL

|  | B21D |
WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING (operations of the kind involved in the manufacture of such products per se Fulltext... Hierarchy... Expanded...B21B, Fulltext... Hierarchy... Expanded...B21C; working or processing of wire Fulltext... Hierarchy... Expanded...B21F; cutting or severing devices or machines in general Fulltext... Hierarchy... Expanded...B26; presses in general Fulltext... Hierarchy... Expanded...B30B)

|  | B21D |
Note(s) In so far as this sub-class provides for cutting or perforating of sheet metal or other stock material, attention is drawn to the fact that it does not include working of metal foils workable in a manner analogous to paper, which is covered by classes Fulltext... Hierarchy... Expanded...B26, Fulltext... Hierarchy... Expanded...B31.

|  | B21F |
WORKING OR PROCESSING OF WIRE (reducing diameter by rolling Fulltext... Hierarchy... Expanded...B21B; by drawing, auxiliary operations used in connection with metal-working without essentially removing material Fulltext... Hierarchy... Expanded...B21C)

|  | B21G |
MAKING NEEDLES, PINS, OR NAILS

|  | B21H |
MAKING PARTICULAR METAL OBJECTS BY ROLLING, e.g. SCREWS, WHEELS, RINGS, BARRELS, BALLS (essentially from sheet metal Fulltext... Hierarchy... Expanded...B21D)

|  | B21H |
Note(s) This sub-class includes only rolling operations which are specially adapted for use in the manufacture of particular objects and which, so far as the invention is concerned, are not combined with any different metal-working operation unless the latter is a subsidiary operation performed in the same machine.

|  | B21J |
FORGING; HAMMERING; PRESSING; RIVETING; FORGE FURNACES (making particular products by forging or pressing Fulltext... Hierarchy... Expanded...B21K; plating or pressure finishing or surfaces Fulltext... Hierarchy... Expanded...B23P; compacting surfaces by blasting with particulate material Fulltext... Hierarchy... Expanded...B24C 1/10; general features of presses, presses for consolidating scrap Fulltext... Hierarchy... Expanded...B30B; furnaces in general Fulltext... Hierarchy... Expanded...F27)

|  | B21K |
MAKING FORGED OR PRESSED PRODUCTS, e.g. HORSE-SHOES, RIVETS, BOLTS, WHEELS (making particular articles by working sheet metal without essentially removing material Fulltext... Hierarchy... Expanded...B21D; processing wire Fulltext... Hierarchy... Expanded...B21F; making pins, needles or nails Fulltext... Hierarchy... Expanded...B21G; making particular articles by rolling Fulltext... Hierarchy... Expanded...B21H; forging machines, pressing machines, hammering machines, in general Fulltext... Hierarchy... Expanded...B21J; making chains Fulltext... Hierarchy... Expanded...B21L; plating Fulltext... Hierarchy... Expanded...B23P 3/00)

|  | B21K |
Note(s) This sub-class includes only forging, pressing, or hammering operations which are specially adapted for use in the manufacture of particular objects and which, so far as the invention is concerned, are not combined with any different metal-working operation unless the latter is a subsidiary operation performed in the same machine.

|  | B21L |
MAKING CHAINS (chains per se Fulltext... Hierarchy... Expanded...F16G)