CPC Subgroup
B28B 21/70 by building-up from preformed elements
Full Title
Methods or machines specially adapted for the production of tubular articles > by building-up from preformed elements
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 (combined with extrusion presses B28B21/54)