A display 306 for confirming {HEAD ~ data reception} is attached to a container body 211 of {TAIL ~ a receiver side container} 21 
A display 306 for confirming { HEAD ~ data reception } is attached to a container body 211 of { TAIL ~ a receiver side container } 21
OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH