IPC Subgroup
B28B 21/58 Steel tubes
Introduced: September 1968
Last revised: January 2006
Full Title
Methods or machines specially adapted for the production of tubular articles > incorporating reinforcements > Steel tubes
Classification Context
- Section:
- PERFORMING OPERATIONS; TRANSPORTING
- Class:
- WORKING CEMENT, CLAY, OR STONE
- Subclass:
- SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER