DIFF Subgroup
G06K 19/0672 Full Title
Record carriers for use with machines and with at least a part designed to carry digital markings > characterised by the kind of the digital marking, e.g. shape, nature, code > Record carriers with conductive marks, printed circuits or semiconductor circuit elements, e.g. credit or identity cards
Of 2 combined children, 0 exist in both systems.
2 codes are CPC-only extensions.