CPC Subgroup Additional Only
B32B 2250/40 Symmetrical or sandwich layers, e.g. ABA, ABCBA, ABCCBA
Full Title
Layers arrangement > Symmetrical or sandwich layers, e.g. ABA, ABCBA, ABCCBA
B32B 2250/40 Layers arrangement > Symmetrical or sandwich layers, e.g. ABA, ABCBA, ABCCBA