CPC Subgroup
G04F 13/04 using electrochemical means
Full Title
Apparatus for measuring unknown time intervals by means not provided for in groups G04F5/00 - G04F10/00 > using electrochemical means
G04F 13/04 Apparatus for measuring unknown time intervals by means not provided for in groups G04F5/00 - G04F10/00 > using electrochemical means