using difference in transit time between electrical and acoustic signals

Introduced: January 1990

Title

Titles differ between systems:

IPC: using difference in transit time between electromagnetic and sonic waves

CPC: using difference in transit time between electrical and acoustic signals

Full Title

Full titles differ between systems:

IPC:

Systems for determining distance or velocity not using reflection or reradiation > using difference in transit time between electromagnetic and sonic waves

CPC:

Systems for determining distance or velocity not using reflection or reradiation (position-fixing by co-ordinating two or more distance determinations G01S5/00) > using difference in transit time between electrical and acoustic signals

No child classifications to compare. This is a leaf node in both IPC and CPC.