DIFF Subgroup
G01R 19/16533 Full Title
Arrangements for measuring currents or voltages or for indicating presence or sign thereof (G01R5/00 takes precedence; for measuring bioelectric currents or voltages A61B5/24) > Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values
Of 3 combined children, 0 exist in both systems.
3 codes are CPC-only extensions.