A signal transmitting method for exchanging {HEAD ~ a liquid} between {TAIL ~ a first liquid container} and a second liquid container, said method comprising the steps of: 
A signal transmitting method for exchanging { HEAD ~ a liquid } between { TAIL ~ a first liquid container } and a second liquid container , said method comprising the steps of :
OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH