The mode selection key is actuated to select {HEAD ~ a memo mode} for inputting and printing out {TAIL ~ memo data} and a calculation mode for operating arithmetic calculation 
for printing out
The mode selection key is actuated to select { HEAD ~ a memo mode } for inputting and printing out { TAIL ~ memo data } and a calculation mode for operating arithmetic calculation
OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL OTH OTH REL REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH