In {HEAD ~ a data processing device} according to {TAIL ~ 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 rotation 
according to
In { HEAD ~ a data processing device } according to { TAIL ~ 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 rotation
OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL 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