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