DIFF Subgroup
B22C 9/043 Full Title
Moulds or cores (uniquely adapted to particular casting processes B22D); Moulding processes > Sand moulds or like moulds for shaped castings > Use of lost patterns
B22C 9/043 Moulds or cores (uniquely adapted to particular casting processes B22D); Moulding processes > Sand moulds or like moulds for shaped castings > Use of lost patterns