DIFF Subgroup Additional Only
H03H 2001/0021 Full Title
Constructional details of impedance networks whose electrical mode of operation is not specified or applicable to more than one type of network (constructional details of electromechanical transducers H03H9/00)
Of 9 combined children, 0 exist in both systems.
9 codes are CPC-only extensions.
Note: 9 CPC extensions are marked as secondary classification only.