PREPARING CLAY; PRODUCING MIXTURES CONTAINING CLAY OR CEMENTITIOUS MATERIAL, e.g. PLASTER (preparing material for foundry moulds Fulltext... Hierarchy... Expanded...B22C 5/00)
B28C
Note(s)
In this subclass, the following terms or expressions are used with the meanings indicated:
"cement" or "mixtures of cement with other substances" includes plaster;