IPC Subgroup
B28B 21/7 by building-up from preformed elements
Introduced: September 1968
Last revised: January 2006
Full Title
Methods or machines specially adapted for the production of tubular articles > by building-up from preformed elements
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
2 direct subcodes
Child Classifications
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- B28B 21/72 Producing multilayer tubes
- B28B 21/74 Producing pipe bends, sockets, sleeves; Moulds therefor