In {HEAD ~ a data processing device} according to yet another embodiment of the invention, the first connector unit and the second connector unit incorporate a rotation prevention mechanism preventing a pivot unit from rotating more than a predetermined angle of {TAIL ~ rotation} 
In { HEAD ~ a data processing device } according to yet another embodiment of the invention , the first connector unit and the second connector unit incorporate a rotation prevention mechanism preventing a pivot unit from rotating more than a predetermined angle of { TAIL ~ rotation }
OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL