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 sub-class:
the term "cement" and the expression "mixtures of cement with other substances" are to be understood to include plaster;
the term "clay" is to be understood to include like ceramic compositions.